diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-2/query-ASTERIXDB-1571-2.1.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-2/query-ASTERIXDB-1571-2.1.ddl.sqlpp
new file mode 100644
index 0000000..07c39e3
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-2/query-ASTERIXDB-1571-2.1.ddl.sqlpp
@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+drop dataverse test if exists;
+create dataverse test;
+use test;
+
+drop dataset samptable if exists;
+drop type samptabletype if exists;
+
+create type samptabletype as closed {
+  id: int8
+};
+
+create dataset samptable(samptabletype) primary key id;
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-2/query-ASTERIXDB-1571-2.2.update.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-2/query-ASTERIXDB-1571-2.2.update.sqlpp
new file mode 100644
index 0000000..d1ad8b5
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-2/query-ASTERIXDB-1571-2.2.update.sqlpp
@@ -0,0 +1,23 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+use test;
+
+insert into samptable ({'id' : 0});
+insert into samptable ({'id' : 1});
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-2/query-ASTERIXDB-1571-2.3.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-2/query-ASTERIXDB-1571-2.3.query.sqlpp
new file mode 100644
index 0000000..19f6f15
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-2/query-ASTERIXDB-1571-2.3.query.sqlpp
@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+use test;
+
+// Negative test, expecting an alias for the subquery.
+select *
+from
+(
+  select * from samptable
+);
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.1.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.1.ddl.sqlpp
new file mode 100644
index 0000000..07c39e3
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.1.ddl.sqlpp
@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+drop dataverse test if exists;
+create dataverse test;
+use test;
+
+drop dataset samptable if exists;
+drop type samptabletype if exists;
+
+create type samptabletype as closed {
+  id: int8
+};
+
+create dataset samptable(samptabletype) primary key id;
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.2.update.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.2.update.sqlpp
new file mode 100644
index 0000000..bd1d4df
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.2.update.sqlpp
@@ -0,0 +1,24 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+use test;
+
+insert into samptable ({'id' : 0});
+
+insert into samptable ({'id' : 1});
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.3.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.3.query.sqlpp
new file mode 100644
index 0000000..5f0fc30
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.3.query.sqlpp
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+use test;
+
+with samptable1 as
+(
+select * from samptable
+)
+
+select *
+from
+(
+  select * from
+  samptable1 s1
+  left outer join
+  samptable1 s2
+  on s1.id = s2.id
+) t
+order by t.s1.samptable.id;
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.1.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.1.ddl.sqlpp
new file mode 100644
index 0000000..07c39e3
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.1.ddl.sqlpp
@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+drop dataverse test if exists;
+create dataverse test;
+use test;
+
+drop dataset samptable if exists;
+drop type samptabletype if exists;
+
+create type samptabletype as closed {
+  id: int8
+};
+
+create dataset samptable(samptabletype) primary key id;
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.2.update.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.2.update.sqlpp
new file mode 100644
index 0000000..bd1d4df
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.2.update.sqlpp
@@ -0,0 +1,24 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+use test;
+
+insert into samptable ({'id' : 0});
+
+insert into samptable ({'id' : 1});
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.3.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.3.query.sqlpp
new file mode 100644
index 0000000..2e383c9
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.3.query.sqlpp
@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+use test;
+
+with samptable1 as
+(
+select * from samptable
+)
+
+select *
+from
+(
+  select * from
+  samptable1 s1
+  left outer join
+  samptable1 s2
+  on s1.samptable.id = s2.samptable.id
+) t
+order by t.s1.samptable.id;
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.1.ddl.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.1.ddl.sqlpp
new file mode 100644
index 0000000..07c39e3
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.1.ddl.sqlpp
@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+drop dataverse test if exists;
+create dataverse test;
+use test;
+
+drop dataset samptable if exists;
+drop type samptabletype if exists;
+
+create type samptabletype as closed {
+  id: int8
+};
+
+create dataset samptable(samptabletype) primary key id;
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.2.update.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.2.update.sqlpp
new file mode 100644
index 0000000..d1ad8b5
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.2.update.sqlpp
@@ -0,0 +1,23 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+use test;
+
+insert into samptable ({'id' : 0});
+insert into samptable ({'id' : 1});
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.3.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.3.query.sqlpp
new file mode 100644
index 0000000..5c79bec
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.3.query.sqlpp
@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+use test;
+
+select *
+from
+(
+  select * from samptable
+) t
+order by t.samptable.id;
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.1.adm b/asterixdb/asterix-app/src/test/resources/runtimets/results/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.1.adm
new file mode 100644
index 0000000..d378a1a
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/subquery/query-ASTERIXDB-1571-3/query-ASTERIXDB-1571-3.1.adm
@@ -0,0 +1,2 @@
+{ "t": { "s1": { "samptable": { "id": 0 } } } }
+{ "t": { "s1": { "samptable": { "id": 1 } } } }
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.1.adm b/asterixdb/asterix-app/src/test/resources/runtimets/results/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.1.adm
new file mode 100644
index 0000000..2e481ff
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/subquery/query-ASTERIXDB-1571-4/query-ASTERIXDB-1571-4.1.adm
@@ -0,0 +1,2 @@
+{ "t": { "s1": { "samptable": { "id": 0 } }, "s2": { "samptable": { "id": 0 } } } }
+{ "t": { "s1": { "samptable": { "id": 1 } }, "s2": { "samptable": { "id": 1 } } } }
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.1.adm b/asterixdb/asterix-app/src/test/resources/runtimets/results/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.1.adm
new file mode 100644
index 0000000..500d412
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/subquery/query-ASTERIXDB-1571/query-ASTERIXDB-1571.1.adm
@@ -0,0 +1,2 @@
+{ "t": { "samptable": { "id": 0 } } }
+{ "t": { "samptable": { "id": 1 } } }
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
index e0e6e87..ffdfe3b 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/testsuite_sqlpp.xml
@@ -5474,6 +5474,27 @@
         <output-dir compare="Text">relational_division</output-dir>
       </compilation-unit>
     </test-case>
+    <test-case FilePath="subquery">
+      <compilation-unit name="query-ASTERIXDB-1571">
+        <output-dir compare="Text">query-ASTERIXDB-1571</output-dir>
+      </compilation-unit>
+    </test-case>
+    <test-case FilePath="subquery">
+      <compilation-unit name="query-ASTERIXDB-1571-2">
+        <output-dir compare="Text">query-ASTERIXDB-1571</output-dir>
+        <expected-error>Need an alias for the enclosed expression</expected-error>
+      </compilation-unit>
+    </test-case>
+    <test-case FilePath="subquery">
+      <compilation-unit name="query-ASTERIXDB-1571-3">
+        <output-dir compare="Text">query-ASTERIXDB-1571-3</output-dir>
+      </compilation-unit>
+    </test-case>
+    <test-case FilePath="subquery">
+      <compilation-unit name="query-ASTERIXDB-1571-4">
+        <output-dir compare="Text">query-ASTERIXDB-1571-4</output-dir>
+      </compilation-unit>
+    </test-case>
   </test-group>
   <test-group name="subset-collection">
     <test-case FilePath="subset-collection">
diff --git a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/DeepCopyVisitor.java b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/DeepCopyVisitor.java
index 75c5307..f6d3e7f 100644
--- a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/DeepCopyVisitor.java
+++ b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/DeepCopyVisitor.java
@@ -131,7 +131,8 @@
 
     @Override
     public Projection visit(Projection projection, Void arg) throws AsterixException {
-        return new Projection((Expression) projection.getExpression().accept(this, arg), projection.getName(),
+        return new Projection(projection.star() ? null : (Expression) projection.getExpression().accept(this, arg),
+                projection.getName(),
                 projection.star(), projection.exprStar());
     }
 
diff --git a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/SqlppAstPrintVisitor.java b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/SqlppAstPrintVisitor.java
index 4413961..908f799 100644
--- a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/SqlppAstPrintVisitor.java
+++ b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/SqlppAstPrintVisitor.java
@@ -130,6 +130,9 @@
 
     @Override
     public Void visit(Projection projection, Integer step) throws AsterixException {
+        if (projection.star()) {
+            out.println(skip(step) + "*");
+        }
         projection.getExpression().accept(this, step);
         out.println(skip(step) + projection.getName());
         return null;
diff --git a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/SqlppFormatPrintVisitor.java b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/SqlppFormatPrintVisitor.java
index 0363e20..1beba9b 100644
--- a/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/SqlppFormatPrintVisitor.java
+++ b/asterixdb/asterix-lang-sqlpp/src/main/java/org/apache/asterix/lang/sqlpp/visitor/SqlppFormatPrintVisitor.java
@@ -26,6 +26,7 @@
 import org.apache.asterix.lang.common.clause.GroupbyClause;
 import org.apache.asterix.lang.common.clause.LetClause;
 import org.apache.asterix.lang.common.expression.GbyVariableExpressionPair;
+import org.apache.asterix.lang.common.expression.VariableExpr;
 import org.apache.asterix.lang.common.statement.InsertStatement;
 import org.apache.asterix.lang.common.visitor.FormatPrintVisitor;
 import org.apache.asterix.lang.sqlpp.clause.AbstractBinaryCorrelateClause;
@@ -45,6 +46,7 @@
 import org.apache.asterix.lang.sqlpp.expression.IndependentSubquery;
 import org.apache.asterix.lang.sqlpp.expression.SelectExpression;
 import org.apache.asterix.lang.sqlpp.struct.SetOperationRight;
+import org.apache.asterix.lang.sqlpp.util.SqlppVariableUtil;
 import org.apache.asterix.lang.sqlpp.visitor.base.ISqlppVisitor;
 
 public class SqlppFormatPrintVisitor extends FormatPrintVisitor implements ISqlppVisitor<Void, Integer> {
@@ -127,6 +129,10 @@
 
     @Override
     public Void visit(Projection projection, Integer step) throws AsterixException {
+        if (projection.star()) {
+            out.print(" * ");
+            return null;
+        }
         projection.getExpression().accept(this, step);
         String name = projection.getName();
         if (name != null) {
@@ -329,4 +335,9 @@
         return null;
     }
 
+    @Override
+    public Void visit(VariableExpr v, Integer step) {
+        out.print(SqlppVariableUtil.toUserDefinedName(v.getVar().getValue()));
+        return null;
+    }
 }
diff --git a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/properties/TypePropagationPolicy.java b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/properties/TypePropagationPolicy.java
index 061b272..566c13e 100644
--- a/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/properties/TypePropagationPolicy.java
+++ b/hyracks-fullstack/algebricks/algebricks-core/src/main/java/org/apache/hyracks/algebricks/core/algebra/properties/TypePropagationPolicy.java
@@ -66,7 +66,11 @@
                 List<LogicalVariable> nonNullVariableList, List<List<LogicalVariable>> correlatedNullableVariableLists,
                 ITypeEnvPointer... typeEnvs) throws AlgebricksException {
             int n = typeEnvs.length;
-            for (int i = 0; i < n; i++) {
+            // Searches from the inner branch to the outer branch.
+            // TODO(buyingyi): A split operator could lead to the case that the type for a variable could be
+            // found in both inner and outer branches. Fix computeOutputTypeEnvironment() in ProjectOperator
+            // and investigate why many test queries fail if only live variables' types are propagated.
+            for (int i = n - 1; i >= 0; i--) {
                 Object t = typeEnvs[i].getTypeEnv().getVarType(var, nonNullVariableList,
                         correlatedNullableVariableLists);
                 if (t == null) {