diff --git a/asterix-app/src/main/java/edu/uci/ics/asterix/aql/translator/AqlTranslator.java b/asterix-app/src/main/java/edu/uci/ics/asterix/aql/translator/AqlTranslator.java
index 66a3980..d4e5e22 100644
--- a/asterix-app/src/main/java/edu/uci/ics/asterix/aql/translator/AqlTranslator.java
+++ b/asterix-app/src/main/java/edu/uci/ics/asterix/aql/translator/AqlTranslator.java
@@ -59,6 +59,7 @@
 import edu.uci.ics.asterix.aql.expression.TypeDropStatement;
 import edu.uci.ics.asterix.aql.expression.WriteFromQueryResultStatement;
 import edu.uci.ics.asterix.aql.expression.WriteStatement;
+import edu.uci.ics.asterix.aql.util.FunctionUtils;
 import edu.uci.ics.asterix.common.config.DatasetConfig.DatasetType;
 import edu.uci.ics.asterix.common.config.GlobalConfig;
 import edu.uci.ics.asterix.common.exceptions.AsterixException;
@@ -1358,6 +1359,8 @@
             }
             bfs.initialize(metadataProvider.getMetadataTxnContext(), dataset);
             cbfs.setQuery(bfs.getQuery());
+            metadataProvider.getConfig().put(FunctionUtils.IMPORT_PRIVATE_FUNCTIONS, "" + Boolean.TRUE);
+
             JobSpecification compiled = rewriteCompileQuery(metadataProvider, bfs.getQuery(), cbfs);
 
             MetadataManager.INSTANCE.commitTransaction(mdTxnCtx);
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-fuzzyeq-jaccard.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-fuzzyeq-jaccard.aql
index 5e9ac0e..911b63f 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-fuzzyeq-jaccard.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-fuzzyeq-jaccard.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-jaccard-check.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-jaccard-check.aql
index dbb9c71..a42fc6b 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-jaccard-check.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-jaccard-check.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -24,4 +25,4 @@
 
 for $o in dataset('DBLP')
 where similarity-jaccard-check(gram-tokens($o.title, 3, false), gram-tokens("Transactions for Cooperative Environments", 3, false), 0.5f)[0]
-return $o
\ No newline at end of file
+return $o
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-jaccard.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-jaccard.aql
index f25fb8b..b11629f 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-jaccard.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-basic/ngram-jaccard.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-complex/ngram-jaccard-check-let.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-complex/ngram-jaccard-check-let.aql
index fb59040..486fe66 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-complex/ngram-jaccard-check-let.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-complex/ngram-jaccard-check-let.aql
@@ -8,6 +8,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -26,4 +27,4 @@
 for $o in dataset('DBLP')
 let $jacc := similarity-jaccard-check(gram-tokens($o.title, 3, false), gram-tokens("Transactions for Cooperative Environments", 3, false), 0.5f)
 where $jacc[0]
-return $o
\ No newline at end of file
+return $o
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-complex/ngram-jaccard-check-multi-let.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-complex/ngram-jaccard-check-multi-let.aql
index b86c6b2..7dfc9f6 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-complex/ngram-jaccard-check-multi-let.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-complex/ngram-jaccard-check-multi-let.aql
@@ -8,6 +8,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -29,4 +30,4 @@
 let $query_tokens := gram-tokens("Transactions for Cooperative Environments", 3, false)
 let $jacc := similarity-jaccard-check($paper_tokens, $query_tokens, 0.5f)
 where $jacc[0]
-return {"Paper": $paper_tokens, "Query": $query_tokens }
\ No newline at end of file
+return {"Paper": $paper_tokens, "Query": $query_tokens }
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-fuzzyeq-jaccard.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-fuzzyeq-jaccard.aql
index 1a97936..5b2be0c 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-fuzzyeq-jaccard.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-fuzzyeq-jaccard.aql
@@ -8,6 +8,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -39,4 +40,4 @@
 for $a in dataset('DBLP')
 for $b in dataset('CSX')
 where gram-tokens($a.title, 3, false) ~= gram-tokens($b.title, 3, false) and $a.id < $b.id
-return {"atitle": $a.title, "btitle": $b.title}
\ No newline at end of file
+return {"atitle": $a.title, "btitle": $b.title}
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-jaccard-inline.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-jaccard-inline.aql
index bf6bb82..d4ec177 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-jaccard-inline.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-jaccard-inline.aql
@@ -9,6 +9,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -28,4 +29,4 @@
 for $b in dataset('DBLP')
 let $jacc := similarity-jaccard(gram-tokens($a.title, 3, false), gram-tokens($b.title, 3, false))
 where $jacc >= 0.5f and $a.id < $b.id
-return {"atitle": $a.title, "btitle": $b.title, "jacc": $jacc}
\ No newline at end of file
+return {"atitle": $a.title, "btitle": $b.title, "jacc": $jacc}
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-jaccard.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-jaccard.aql
index dae2a78..1e7df4b 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-jaccard.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join-noeqjoin/ngram-jaccard.aql
@@ -8,6 +8,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -37,4 +38,4 @@
 for $b in dataset('CSX')
 where similarity-jaccard(gram-tokens($a.title, 3, false), gram-tokens($b.title, 3, false)) >= 0.5f
       and $a.id < $b.id
-return {"atitle": $a.title, "btitle": $b.title}
\ No newline at end of file
+return {"atitle": $a.title, "btitle": $b.title}
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_01.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_01.aql
index 84fb8f3..931734c 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_01.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_01.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -38,4 +39,4 @@
 for $a in dataset('DBLP')
 for $b in dataset('CSX')
 where gram-tokens($a.title, 3, false) ~= gram-tokens($b.title, 3, false) and $a.id < $b.id
-return {"arec": $a, "brec": $b }
\ No newline at end of file
+return {"arec": $a, "brec": $b }
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_02.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_02.aql
index d0c3c6f..ecbeea7 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_02.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_02.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -38,4 +39,4 @@
 for $a in dataset('DBLP')
 for $b in dataset('CSX')
 where gram-tokens($a.title, 3, false) ~= gram-tokens($b.title, 3, false) and $a.id < $b.id
-return {"arec": $a, "brec": $b }
\ No newline at end of file
+return {"arec": $a, "brec": $b }
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_03.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_03.aql
index a725edc..b437183 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_03.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-fuzzyeq-jaccard_03.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -28,4 +29,4 @@
 for $a in dataset('DBLP')
 for $b in dataset('DBLP')
 where gram-tokens($a.title, 3, false) ~= gram-tokens($b.title, 3, false) and $a.id < $b.id
-return {"arec": $a, "brec": $b }
\ No newline at end of file
+return {"arec": $a, "brec": $b }
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_01.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_01.aql
index c25e2e3..d554d76 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_01.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_01.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -36,4 +37,4 @@
 for $b in dataset('CSX')
 where similarity-jaccard-check(gram-tokens($a.title, 3, false), gram-tokens($b.title, 3, false), 0.5f)[0]
       and $a.id < $b.id
-return {"arec": $a, "brec": $b }
\ No newline at end of file
+return {"arec": $a, "brec": $b }
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_02.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_02.aql
index 0e9f4d5..d60baad 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_02.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_02.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -36,4 +37,4 @@
 for $b in dataset('CSX')
 where similarity-jaccard-check(gram-tokens($a.title, 3, false), gram-tokens($b.title, 3, false), 0.5f)[0]
       and $a.id < $b.id
-return {"arec": $a, "brec": $b }
\ No newline at end of file
+return {"arec": $a, "brec": $b }
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_03.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_03.aql
index bbd0f51..cc7dded 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_03.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_03.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -26,4 +27,4 @@
 for $b in dataset('DBLP')
 where similarity-jaccard-check(gram-tokens($a.title, 3, false), gram-tokens($b.title, 3, false), 0.5f)[0]
       and $a.id < $b.id
-return {"arec": $a, "brec": $b }
\ No newline at end of file
+return {"arec": $a, "brec": $b }
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_04.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_04.aql
index 956f712..e51adbd 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_04.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard-check_04.aql
@@ -8,6 +8,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -27,4 +28,4 @@
 for $b in dataset('DBLP')
 let $jacc := similarity-jaccard-check(gram-tokens($a.title, 3, false), gram-tokens($b.title, 3, false), 0.5f)
 where $jacc[0] and $a.id < $b.id
-return {"arec": $a, "brec": $b, "jacc": $jacc[1] }
\ No newline at end of file
+return {"arec": $a, "brec": $b, "jacc": $jacc[1] }
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_01.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_01.aql
index 742cb69..3893857 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_01.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_01.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -36,4 +37,4 @@
 for $b in dataset('CSX')
 where similarity-jaccard(gram-tokens($a.title, 3, false), gram-tokens($b.title, 3, false)) >= 0.5f
       and $a.id < $b.id
-return {"arec": $a, "brec": $b }
\ No newline at end of file
+return {"arec": $a, "brec": $b }
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_02.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_02.aql
index a620399..372d622 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_02.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_02.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -36,4 +37,4 @@
 for $b in dataset('CSX')
 where similarity-jaccard(gram-tokens($a.title, 3, false), gram-tokens($b.title, 3, false)) >= 0.5f
       and $a.id < $b.id
-return {"arec": $a, "brec": $b }
\ No newline at end of file
+return {"arec": $a, "brec": $b }
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_03.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_03.aql
index d12bf98..568bcfa 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_03.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_03.aql
@@ -7,6 +7,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -26,4 +27,4 @@
 for $b in dataset('DBLP')
 where similarity-jaccard(gram-tokens($a.title, 3, false), gram-tokens($b.title, 3, false)) >= 0.5f
       and $a.id < $b.id
-return {"arec": $a, "brec": $b }
\ No newline at end of file
+return {"arec": $a, "brec": $b }
diff --git a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_04.aql b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_04.aql
index 6b308c8..c1a08b9 100644
--- a/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_04.aql
+++ b/asterix-app/src/test/resources/optimizerts/queries/inverted-index-join/ngram-jaccard_04.aql
@@ -8,6 +8,7 @@
 drop dataverse test if exists;
 create dataverse test;
 use dataverse test;
+set import-private-functions 'true';
 
 create type DBLPType as closed {
   id: int32, 
@@ -27,4 +28,4 @@
 for $b in dataset('DBLP')
 let $jacc := similarity-jaccard(gram-tokens($a.title, 3, false), gram-tokens($b.title, 3, false))
 where $jacc >= 0.5f and $a.id < $b.id
-return {"arec": $a, "brec": $b, "jacc": $jacc }
\ No newline at end of file
+return {"arec": $a, "brec": $b, "jacc": $jacc }
diff --git a/asterix-app/src/test/resources/runtimets/queries/aggregate/sum_null-with-pred/sum_null-with-pred.3.query.aql b/asterix-app/src/test/resources/runtimets/queries/aggregate/sum_null-with-pred/sum_null-with-pred.3.query.aql
index 432866f..144f427 100644
--- a/asterix-app/src/test/resources/runtimets/queries/aggregate/sum_null-with-pred/sum_null-with-pred.3.query.aql
+++ b/asterix-app/src/test/resources/runtimets/queries/aggregate/sum_null-with-pred/sum_null-with-pred.3.query.aql
@@ -6,6 +6,7 @@
  */
 
 use dataverse test;
+set import-private-functions 'true';
 
 sum(for $l in dataset('tdst')
 where not(is-null($l.sal))
diff --git a/asterix-app/src/test/resources/runtimets/queries/boolean/not_01/not_01.3.query.aql b/asterix-app/src/test/resources/runtimets/queries/boolean/not_01/not_01.3.query.aql
index af1a6bc..059da38 100644
--- a/asterix-app/src/test/resources/runtimets/queries/boolean/not_01/not_01.3.query.aql
+++ b/asterix-app/src/test/resources/runtimets/queries/boolean/not_01/not_01.3.query.aql
@@ -1,4 +1,5 @@
 use dataverse test;
+set import-private-functions 'true';
 
 let $x := true
 let $y := false
diff --git a/asterix-app/src/test/resources/runtimets/queries/misc/is-null_01/is-null_01.3.query.aql b/asterix-app/src/test/resources/runtimets/queries/misc/is-null_01/is-null_01.3.query.aql
index 7725698..61220f7 100644
--- a/asterix-app/src/test/resources/runtimets/queries/misc/is-null_01/is-null_01.3.query.aql
+++ b/asterix-app/src/test/resources/runtimets/queries/misc/is-null_01/is-null_01.3.query.aql
@@ -1,3 +1,4 @@
 use dataverse test;
+set import-private-functions 'true';
 
 [is-null(null), is-null(10)]
diff --git a/asterix-app/src/test/resources/runtimets/queries/quantifiers/everysat_04/everysat_04.3.query.aql b/asterix-app/src/test/resources/runtimets/queries/quantifiers/everysat_04/everysat_04.3.query.aql
index 7742254..e5e425f 100644
--- a/asterix-app/src/test/resources/runtimets/queries/quantifiers/everysat_04/everysat_04.3.query.aql
+++ b/asterix-app/src/test/resources/runtimets/queries/quantifiers/everysat_04/everysat_04.3.query.aql
@@ -4,6 +4,7 @@
  */
 
 use dataverse test;
+set import-private-functions 'true';
 
 let $x := [
 every $x in [false,false] satisfies $x,
diff --git a/asterix-app/src/test/resources/runtimets/queries/quantifiers/somesat_06/somesat_06.3.query.aql b/asterix-app/src/test/resources/runtimets/queries/quantifiers/somesat_06/somesat_06.3.query.aql
index e406cda..4d75664 100644
--- a/asterix-app/src/test/resources/runtimets/queries/quantifiers/somesat_06/somesat_06.3.query.aql
+++ b/asterix-app/src/test/resources/runtimets/queries/quantifiers/somesat_06/somesat_06.3.query.aql
@@ -4,6 +4,7 @@
  */
 
 use dataverse test;
+set import-private-functions 'true';
 
 let $x := [
 some $x in [false,false] satisfies $x,
diff --git a/asterix-app/src/test/resources/runtimets/queries/semistructured/has-param1/has-param1.3.query.aql b/asterix-app/src/test/resources/runtimets/queries/semistructured/has-param1/has-param1.3.query.aql
index 4247586..53e4ace 100644
--- a/asterix-app/src/test/resources/runtimets/queries/semistructured/has-param1/has-param1.3.query.aql
+++ b/asterix-app/src/test/resources/runtimets/queries/semistructured/has-param1/has-param1.3.query.aql
@@ -1,4 +1,5 @@
 use dataverse test;
+set import-private-functions 'true';
 
 for $o in dataset('Orders')
 where not(is-null($o.param1))
diff --git a/asterix-app/src/test/resources/runtimets/queries/tpch/q13_customer_distribution/q13_customer_distribution.3.query.aql b/asterix-app/src/test/resources/runtimets/queries/tpch/q13_customer_distribution/q13_customer_distribution.3.query.aql
index a75b9c9..dd65443 100644
--- a/asterix-app/src/test/resources/runtimets/queries/tpch/q13_customer_distribution/q13_customer_distribution.3.query.aql
+++ b/asterix-app/src/test/resources/runtimets/queries/tpch/q13_customer_distribution/q13_customer_distribution.3.query.aql
@@ -1,4 +1,5 @@
 use dataverse tpch;
+set import-private-functions 'true';
 
 for $gco in (
 	for $co in
diff --git a/asterix-app/src/test/resources/runtimets/queries/user-defined-functions/udf18/udf18.3.query.aql b/asterix-app/src/test/resources/runtimets/queries/user-defined-functions/udf18/udf18.3.query.aql
index 0bdf0e4..c2af48d 100644
--- a/asterix-app/src/test/resources/runtimets/queries/user-defined-functions/udf18/udf18.3.query.aql
+++ b/asterix-app/src/test/resources/runtimets/queries/user-defined-functions/udf18/udf18.3.query.aql
@@ -5,6 +5,7 @@
  */
 
 use dataverse test;
+set import-private-functions 'true';
 
 let $val := not(test.fn06())
 return $val
diff --git a/asterix-aql/src/main/java/edu/uci/ics/asterix/aql/expression/BeginFeedStatement.java b/asterix-aql/src/main/java/edu/uci/ics/asterix/aql/expression/BeginFeedStatement.java
index 422ca79..d7de106 100644
--- a/asterix-aql/src/main/java/edu/uci/ics/asterix/aql/expression/BeginFeedStatement.java
+++ b/asterix-aql/src/main/java/edu/uci/ics/asterix/aql/expression/BeginFeedStatement.java
@@ -8,7 +8,9 @@
 import edu.uci.ics.asterix.aql.expression.visitor.IAqlVisitorWithVoidReturn;
 import edu.uci.ics.asterix.aql.parser.AQLParser;
 import edu.uci.ics.asterix.aql.parser.ParseException;
+import edu.uci.ics.asterix.aql.util.FunctionUtils;
 import edu.uci.ics.asterix.common.exceptions.AsterixException;
+import edu.uci.ics.asterix.common.functions.FunctionConstants;
 import edu.uci.ics.asterix.common.functions.FunctionSignature;
 import edu.uci.ics.asterix.metadata.MetadataException;
 import edu.uci.ics.asterix.metadata.MetadataManager;
@@ -35,6 +37,7 @@
         FeedDatasetDetails feedDetails = (FeedDatasetDetails) dataset.getDatasetDetails();
         String functionName = feedDetails.getFunction() == null ? null : feedDetails.getFunction().getName();
         StringBuilder builder = new StringBuilder();
+        builder.append("set" + " " + FunctionUtils.IMPORT_PRIVATE_FUNCTIONS + " " + "'" + Boolean.TRUE + "'" + ";\n");
         builder.append("insert into dataset " + datasetName + " ");
 
         if (functionName == null) {
@@ -65,7 +68,7 @@
         List<Statement> statements;
         try {
             statements = parser.Statement();
-            query = ((InsertStatement) statements.get(0)).getQuery();
+            query = ((InsertStatement) statements.get(1)).getQuery();
         } catch (ParseException pe) {
             throw new MetadataException(pe);
         }
diff --git a/asterix-aql/src/main/java/edu/uci/ics/asterix/aql/rewrites/AqlRewriter.java b/asterix-aql/src/main/java/edu/uci/ics/asterix/aql/rewrites/AqlRewriter.java
index d581b06..8e2c4d3 100644
--- a/asterix-aql/src/main/java/edu/uci/ics/asterix/aql/rewrites/AqlRewriter.java
+++ b/asterix-aql/src/main/java/edu/uci/ics/asterix/aql/rewrites/AqlRewriter.java
@@ -173,14 +173,8 @@
             } else {
                 String value = metadataProvider.getConfig().get(FunctionUtils.IMPORT_PRIVATE_FUNCTIONS);
                 boolean includePrivateFunctions = (value != null) ? Boolean.valueOf(value.toLowerCase()) : false;
-                signature.setNamespace(AsterixBuiltinFunctions.FunctionNamespace.ASTERIX_PUBLIC.name());
-                if (isBuiltinFunction(signature)) {
+                if (isBuiltinFunction(signature, includePrivateFunctions)) {
                     continue;
-                } else if (includePrivateFunctions) {
-                    signature.setNamespace(AsterixBuiltinFunctions.FunctionNamespace.ASTERIX_PRIVATE.name());
-                    if (isBuiltinFunction(signature)) {
-                        continue;
-                    }
                 } else {
                     throw new AsterixException(" unknown function " + signature);
                 }
@@ -200,15 +194,25 @@
 
     }
 
-    private boolean isBuiltinFunction(FunctionSignature signature) {
+    private boolean isBuiltinFunction(FunctionSignature signature, boolean includePrivateFunctions) {
+        signature.setNamespace(AsterixBuiltinFunctions.FunctionNamespace.ASTERIX_PUBLIC.name());
         if (AsterixBuiltinFunctions.isBuiltinCompilerFunction(new FunctionIdentifier(signature.getNamespace(),
                 signature.getName(), signature.getArity()))) {
             return true;
         }
 
-        if (AsterixBuiltinFunctions.isBuiltinCompilerFunction(new FunctionIdentifier(
-                AlgebricksBuiltinFunctions.ALGEBRICKS_NS, signature.getName(), signature.getArity()))) {
-            return true;
+        if (includePrivateFunctions) {
+            signature.setNamespace(AlgebricksBuiltinFunctions.ALGEBRICKS_NS);
+            if (AsterixBuiltinFunctions.isBuiltinCompilerFunction(new FunctionIdentifier(signature.getNamespace(),
+                    signature.getName(), signature.getArity()))) {
+                return true;
+            }
+
+            signature.setNamespace(AsterixBuiltinFunctions.FunctionNamespace.ASTERIX_PRIVATE.name());
+            if (AsterixBuiltinFunctions.isBuiltinCompilerFunction(new FunctionIdentifier(signature.getNamespace(),
+                    signature.getName(), signature.getArity()))) {
+                return true;
+            }
         }
 
         return false;
diff --git a/asterix-om/src/main/java/edu/uci/ics/asterix/om/functions/AsterixBuiltinFunctions.java b/asterix-om/src/main/java/edu/uci/ics/asterix/om/functions/AsterixBuiltinFunctions.java
index c47b123..6da9a8e 100644
--- a/asterix-om/src/main/java/edu/uci/ics/asterix/om/functions/AsterixBuiltinFunctions.java
+++ b/asterix-om/src/main/java/edu/uci/ics/asterix/om/functions/AsterixBuiltinFunctions.java
@@ -232,7 +232,7 @@
     public final static FunctionIdentifier DATASET = new FunctionIdentifier(FunctionNamespace.ASTERIX_PUBLIC.name(),
             "dataset", 1);
     public final static FunctionIdentifier FEED_INGEST = new FunctionIdentifier(
-            FunctionNamespace.ASTERIX_PUBLIC.name(), "feed-ingest", 1);
+            FunctionNamespace.ASTERIX_PRIVATE.name(), "feed-ingest", 1);
 
     public final static FunctionIdentifier INDEX_SEARCH = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PRIVATE.name(), "index-search", FunctionIdentifier.VARARGS);
@@ -348,14 +348,14 @@
     public final static FunctionIdentifier COUNTHASHED_WORD_TOKENS = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PRIVATE.name(), "counthashed-word-tokens", 1);
     public final static FunctionIdentifier GRAM_TOKENS = new FunctionIdentifier(
-            FunctionNamespace.ASTERIX_PUBLIC.name(), "gram-tokens", 3);
+            FunctionNamespace.ASTERIX_PRIVATE.name(), "gram-tokens", 3);
     public final static FunctionIdentifier HASHED_GRAM_TOKENS = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PUBLIC.name(), "hashed-gram-tokens", 3);
     public final static FunctionIdentifier COUNTHASHED_GRAM_TOKENS = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PUBLIC.name(), "counthashed-gram-tokens", 3);
 
-    public final static FunctionIdentifier TID = new FunctionIdentifier(FunctionNamespace.ASTERIX_PUBLIC.name(), "tid",
-            0);
+    public final static FunctionIdentifier TID = new FunctionIdentifier(FunctionNamespace.ASTERIX_PRIVATE.name(),
+            "tid", 0);
 
     // constructors:
     public final static FunctionIdentifier BOOLEAN_CONSTRUCTOR = new FunctionIdentifier(
@@ -447,7 +447,7 @@
     public final static FunctionIdentifier YEAR_MONTH_DURATION_LESS_THAN = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PRIVATE.name(), "year-month-duration-less-than", 2);
     public final static FunctionIdentifier DAY_TIME_DURATION_GREATER_THAN = new FunctionIdentifier(
-            FunctionNamespace.ASTERIX_PUBLIC.name(), "day-time-duration-greater-than", 2);
+            FunctionNamespace.ASTERIX_PRIVATE.name(), "day-time-duration-greater-than", 2);
     public final static FunctionIdentifier DAY_TIME_DURATION_LESS_THAN = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PUBLIC.name(), "day-time-duration-less-than", 2);
     public final static FunctionIdentifier DURATION_FROM_MONTHS = new FunctionIdentifier(
@@ -476,8 +476,8 @@
             FunctionNamespace.ASTERIX_PUBLIC.name(), "spatial-area", 1);
     public final static FunctionIdentifier SPATIAL_DISTANCE = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PUBLIC.name(), "spatial-distance", 2);
-    public final static FunctionIdentifier CREATE_MBR = new FunctionIdentifier(FunctionNamespace.ASTERIX_PUBLIC.name(),
-            "create-mbr", 3);
+    public final static FunctionIdentifier CREATE_MBR = new FunctionIdentifier(
+            FunctionNamespace.ASTERIX_PRIVATE.name(), "create-mbr", 3);
     public final static FunctionIdentifier SPATIAL_CELL = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PUBLIC.name(), "spatial-cell", 4);
     public final static FunctionIdentifier SWITCH_CASE = new FunctionIdentifier(
@@ -518,25 +518,25 @@
     public static final FunctionIdentifier DATE_FROM_DATETIME = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PUBLIC.name(), "date-from-datetime", 1);
     public final static FunctionIdentifier ADD_DATE_DURATION = new FunctionIdentifier(
-            FunctionNamespace.ASTERIX_PRIVATE.name(), "add-date-duration", 2);
+            FunctionNamespace.ASTERIX_PUBLIC.name(), "add-date-duration", 2);
     public final static FunctionIdentifier SUBTRACT_DATE = new FunctionIdentifier(
-            FunctionNamespace.ASTERIX_PRIVATE.name(), "subtract-date", 2);
+            FunctionNamespace.ASTERIX_PUBLIC.name(), "subtract-date", 2);
     public final static FunctionIdentifier TIME_FROM_UNIX_TIME_IN_MS = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PUBLIC.name(), "time-from-unix-time-in-ms", 1);
     public final static FunctionIdentifier TIME_FROM_DATETIME = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PUBLIC.name(), "time-from-datetime", 1);
     public final static FunctionIdentifier SUBTRACT_TIME = new FunctionIdentifier(
-            FunctionNamespace.ASTERIX_PRIVATE.name(), "subtract-time", 2);
+            FunctionNamespace.ASTERIX_PUBLIC.name(), "subtract-time", 2);
     public final static FunctionIdentifier ADD_TIME_DURATION = new FunctionIdentifier(
-            FunctionNamespace.ASTERIX_PRIVATE.name(), "add-time-duration", 2);
+            FunctionNamespace.ASTERIX_PUBLIC.name(), "add-time-duration", 2);
     public final static FunctionIdentifier DATETIME_FROM_UNIX_TIME_IN_MS = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PUBLIC.name(), "datetime-from-unix-time-in-ms", 1);
     public final static FunctionIdentifier DATETIME_FROM_DATE_TIME = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PUBLIC.name(), "datetime-from-date-time", 2);
     public final static FunctionIdentifier SUBTRACT_DATETIME = new FunctionIdentifier(
-            FunctionNamespace.ASTERIX_PRIVATE.name(), "subtract-datetime", 2);
+            FunctionNamespace.ASTERIX_PUBLIC.name(), "subtract-datetime", 2);
     public final static FunctionIdentifier ADD_DATETIME_DURATION = new FunctionIdentifier(
-            FunctionNamespace.ASTERIX_PRIVATE.name(), "add-datetime-duration", 2);
+            FunctionNamespace.ASTERIX_PUBLIC.name(), "add-datetime-duration", 2);
     public final static FunctionIdentifier CALENDAR_DURATION_FROM_DATETIME = new FunctionIdentifier(
             FunctionNamespace.ASTERIX_PUBLIC.name(), "calendar-duration-from-datetime", 2);
     public final static FunctionIdentifier CALENDAR_DURATION_FROM_DATE = new FunctionIdentifier(