fix issue

Signed-off-by: Rohit Bhagat <rohitbgt@amazon.com>

Author: rohit01010

src/backend/parser/parse_clause.c

@@ -3430,6 +3430,20 @@ addTargetToSortList(ParseState *pstate, TargetEntry *tle,
 											COERCION_IMPLICIT,
 											COERCE_IMPLICIT_CAST,
 											-1);
+		else if (IsA(tle->expr, Const) && !((Const *) tle->expr)->constisnull)
+		{
+			Oid			sys_varcharoid;
+			int32		typmod = strlen(DatumGetCString(((Const *) tle->expr)->constvalue)) + VARHDRSZ;
+			TypeName   *varcharTypeName = makeTypeNameFromNameList(list_make2(makeString("sys"),
+																			  makeString("varchar")));
+
+			sys_varcharoid = typenameTypeId(NULL, (const TypeName *) varcharTypeName);
+			tle->expr = (Expr *) coerce_to_target_type(pstate, (Node *) tle->expr,
+													   restype, sys_varcharoid, typmod,
+													   COERCION_IMPLICIT,
+													   COERCE_IMPLICIT_CAST,
+													   -1);
+		}
 		restype = TEXTOID;
 	}
 
@@ -3572,6 +3586,20 @@ addTargetToGroupList(ParseState *pstate, TargetEntry *tle,
 											COERCION_IMPLICIT,
 											COERCE_IMPLICIT_CAST,
 											-1);
+		else if (IsA(tle->expr, Const) && !((Const *) tle->expr)->constisnull)
+		{
+			Oid			sys_varcharoid;
+			int32		typmod = strlen(DatumGetCString(((Const *) tle->expr)->constvalue)) + VARHDRSZ;
+			TypeName   *varcharTypeName = makeTypeNameFromNameList(list_make2(makeString("sys"),
+																			  makeString("varchar")));
+
+			sys_varcharoid = typenameTypeId(NULL, (const TypeName *) varcharTypeName);
+			tle->expr = (Expr *) coerce_to_target_type(pstate, (Node *) tle->expr,
+													   restype, sys_varcharoid, typmod,
+													   COERCION_IMPLICIT,
+													   COERCE_IMPLICIT_CAST,
+													   -1);
+		}
 		restype = TEXTOID;
 	}