HAWQ-1838. fix attribute typmod for CREATE TABLE AS SELECT

src/backend/nodes/copyfuncs.c

@@ -1375,6 +1375,7 @@ _copyConst(Const *from)
 	Const	   *newnode = makeNode(Const);
 
 	COPY_SCALAR_FIELD(consttype);
+	COPY_SCALAR_FIELD(consttypmod);
 	COPY_SCALAR_FIELD(constlen);
 
 	if (from->constbyval || from->constisnull)

src/backend/nodes/equalfuncs.c

@@ -195,6 +195,7 @@ static bool
 _equalConst(Const *a, Const *b)
 {
 	COMPARE_SCALAR_FIELD(consttype);
+	COMPARE_SCALAR_FIELD(consttypmod);
 	COMPARE_SCALAR_FIELD(constlen);
 	COMPARE_SCALAR_FIELD(constisnull);
 	COMPARE_SCALAR_FIELD(constbyval);

src/backend/nodes/makefuncs.c

@@ -155,6 +155,7 @@ makeConst(Oid consttype,
 	Const	   *cnst = makeNode(Const);
 
 	cnst->consttype = consttype;
+	cnst->consttypmod = consttypmod;
 	cnst->constlen = constlen;
 	cnst->constvalue = constvalue;
 	cnst->constisnull = constisnull;

src/backend/nodes/outfast.c

@@ -1220,6 +1220,7 @@ _outConst(StringInfo str, Const *node)
 	WRITE_NODE_TYPE("CONST");
 
 	WRITE_OID_FIELD(consttype);
+	WRITE_INT_FIELD(consttypmod);
 	WRITE_INT_FIELD(constlen);
 	WRITE_BOOL_FIELD(constbyval);
 	WRITE_BOOL_FIELD(constisnull);

src/backend/nodes/outfuncs.c

@@ -1210,6 +1210,7 @@ _outConst(StringInfo str, Const *node)
 	WRITE_NODE_TYPE("CONST");
 
 	WRITE_OID_FIELD(consttype);
+	WRITE_INT_FIELD(consttypmod);
 	WRITE_INT_FIELD(constlen);
 	WRITE_BOOL_FIELD(constbyval);
 	WRITE_BOOL_FIELD(constisnull);

src/backend/nodes/readfast.c

@@ -696,6 +696,7 @@ _readConst(const char ** str)
 	READ_LOCALS(Const);
 
 	READ_OID_FIELD(consttype);
+	READ_INT_FIELD(consttypmod);
 	READ_INT_FIELD(constlen);
 	READ_BOOL_FIELD(constbyval);
 	READ_BOOL_FIELD(constisnull);

src/backend/nodes/readfuncs.c

@@ -832,6 +832,7 @@ _readConst(void)
 	READ_LOCALS(Const);
 
 	READ_OID_FIELD(consttype);
+	READ_INT_FIELD(consttypmod);
 	READ_INT_FIELD(constlen);
 	READ_BOOL_FIELD(constbyval);
 	READ_BOOL_FIELD(constisnull);

src/backend/optimizer/util/clauses.c

@@ -1834,6 +1834,9 @@ eval_const_expressions_mutator(Node *node,
 		 */
 		simple = simplify_function(expr->funcid, expr->funcresulttype, args,
 								   true, context);
+		if (simple && IsA(simple, Const)) {
+			((Const*)simple)->consttypmod = exprTypmod(expr);
+		}
 		if (simple)				/* successfully simplified it */
 			return (Node *) simple;
 

src/backend/parser/parse_expr.c

@@ -2579,6 +2579,7 @@ exprTypmod(Node *expr)
 						}
 						break;
 					default:
+						return con->consttypmod;
 						break;
 				}
 			}