Convert comparisons with current-datetime, current-date, and current-time to applicable index searches as though they were constants

Change-Id: Ied64276873afcfbdd31dac313009e47429d8f9b0
Reviewed-on: https://asterix-gerrit.ics.uci.edu/367
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Yingyi Bu <buyingyi@gmail.com>
diff --git a/asterix-app/src/test/resources/optimizerts/results/btree-index/btree-datetime-01.plan b/asterix-app/src/test/resources/optimizerts/results/btree-index/btree-datetime-01.plan
new file mode 100644
index 0000000..9b5e82c
--- /dev/null
+++ b/asterix-app/src/test/resources/optimizerts/results/btree-index/btree-datetime-01.plan
@@ -0,0 +1,11 @@
+-- DISTRIBUTE_RESULT  |PARTITIONED|
+  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+    -- STREAM_PROJECT  |PARTITIONED|
+      -- STREAM_SELECT  |PARTITIONED|
+        -- ASSIGN  |PARTITIONED|
+          -- STREAM_PROJECT  |PARTITIONED|
+            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+              -- BTREE_SEARCH  |PARTITIONED|
+                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
+                  -- ASSIGN  |PARTITIONED|
+                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|
\ No newline at end of file