diff --git a/src/backend/parser/analyze.c b/src/backend/parser/analyze.c
index d3bd6e8c3a0..f5cd033e758 100644
--- a/src/backend/parser/analyze.c
+++ b/src/backend/parser/analyze.c
@@ -45,6 +45,7 @@
 #include "parser/parse_relation.h"
 #include "parser/parse_target.h"
 #include "parser/parse_type.h"
+#include "parser/parser.h"
 #include "parser/parsetree.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/backend_status.h"
@@ -2275,26 +2276,29 @@ transformSetOperationTree(ParseState *pstate, SelectStmt *stmt,
 			 * it has to coerce the type, so failing now would just break
 			 * cases that might work.
 			 */
-			if (lcoltype != UNKNOWNOID)
-				lcolnode = coerce_to_common_type(pstate, lcolnode,
-												 rescoltype, context);
-			else if (IsA(lcolnode, Const) ||
-					 IsA(lcolnode, Param))
+			if(sql_dialect != SQL_DIALECT_TSQL)
 			{
-				lcolnode = coerce_to_common_type(pstate, lcolnode,
-												 rescoltype, context);
-				ltle->expr = (Expr *) lcolnode;
-			}
+				if (lcoltype != UNKNOWNOID)
+					lcolnode = coerce_to_common_type(pstate, lcolnode,
+													rescoltype, context);
+				else if (IsA(lcolnode, Const) ||
+						IsA(lcolnode, Param))
+				{
+					lcolnode = coerce_to_common_type(pstate, lcolnode,
+													rescoltype, context);
+					ltle->expr = (Expr *) lcolnode;
+				}
 
-			if (rcoltype != UNKNOWNOID)
-				rcolnode = coerce_to_common_type(pstate, rcolnode,
-												 rescoltype, context);
-			else if (IsA(rcolnode, Const) ||
-					 IsA(rcolnode, Param))
-			{
-				rcolnode = coerce_to_common_type(pstate, rcolnode,
-												 rescoltype, context);
-				rtle->expr = (Expr *) rcolnode;
+				if (rcoltype != UNKNOWNOID)
+					rcolnode = coerce_to_common_type(pstate, rcolnode,
+													rescoltype, context);
+				else if (IsA(rcolnode, Const) ||
+						IsA(rcolnode, Param))
+				{
+					rcolnode = coerce_to_common_type(pstate, rcolnode,
+													rescoltype, context);
+					rtle->expr = (Expr *) rcolnode;
+				}
 			}
 
 			rescoltypmod = select_common_typmod(pstate,