From 92b1df09eb01d2e4b0f2a363805d7284dc686092 Mon Sep 17 00:00:00 2001
From: naisila <nicypp@gmail.com>
Date: Mon, 25 Jul 2022 16:16:06 +0300
Subject: [PATCH] Add IS JSON predicate to ruleutils_15.c

Relevant PG commit:
33a377608fc29cdd1f6b63be561eab0aee5c81f0
---
 .../distributed/deparser/ruleutils_15.c       | 35 +++++++++++++++++++
 1 file changed, 35 insertions(+)

diff --git a/src/backend/distributed/deparser/ruleutils_15.c b/src/backend/distributed/deparser/ruleutils_15.c
index 4b15a23d0..b2636b62c 100644
--- a/src/backend/distributed/deparser/ruleutils_15.c
+++ b/src/backend/distributed/deparser/ruleutils_15.c
@@ -4954,6 +4954,7 @@ isSimpleNode(Node *node, Node *parentNode, int prettyFlags)
 		case T_NullTest:
 		case T_BooleanTest:
 		case T_DistinctExpr:
+        case T_JsonIsPredicate:
 			switch (nodeTag(parentNode))
 			{
 				case T_FuncExpr:
@@ -6381,6 +6382,40 @@ get_rule_expr(Node *node, deparse_context *context,
 			get_json_constructor((JsonConstructorExpr *) node, context, false);
 			break;
 
+        case T_JsonIsPredicate:
+			{
+				JsonIsPredicate *pred = (JsonIsPredicate *) node;
+
+				if (!PRETTY_PAREN(context))
+					appendStringInfoChar(context->buf, '(');
+
+				get_rule_expr_paren(pred->expr, context, true, node);
+
+				appendStringInfoString(context->buf, " IS JSON");
+
+				switch (pred->value_type)
+				{
+					case JS_TYPE_SCALAR:
+						appendStringInfoString(context->buf, " SCALAR");
+						break;
+					case JS_TYPE_ARRAY:
+						appendStringInfoString(context->buf, " ARRAY");
+						break;
+					case JS_TYPE_OBJECT:
+						appendStringInfoString(context->buf, " OBJECT");
+						break;
+					default:
+						break;
+				}
+
+				if (pred->unique_keys)
+					appendStringInfoString(context->buf, " WITH UNIQUE KEYS");
+
+				if (!PRETTY_PAREN(context))
+					appendStringInfoChar(context->buf, ')');
+			}
+			break;
+
 		case T_List:
 			{
 				char	   *sep;