From 77ccce8560f0fa862759c98f56585e8ff1c1a2a5 Mon Sep 17 00:00:00 2001
From: Umar Hayat <m.umarkiani@gmail.com>
Date: Thu, 7 Nov 2024 10:56:00 +0900
Subject: [PATCH] Add support for PG17

- A new node type is introduced for JSON support, that is
  JsonConstructorExpr - wrapper over FuncExpr/Aggref/WindowFunc for
  SQL/JSON constructors.
- Added additional checks for JsonConstructorExpr expression node for
  which the walker would crash.
- Removed palloc0fast function call (which is not available in PG17)
---
 src/backend/nodes/ag_nodes.c        |  2 +-
 src/backend/parser/cypher_analyze.c | 10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/backend/nodes/ag_nodes.c b/src/backend/nodes/ag_nodes.c
index e20670b2b..54bd27314 100644
--- a/src/backend/nodes/ag_nodes.c
+++ b/src/backend/nodes/ag_nodes.c
@@ -156,7 +156,7 @@ ExtensibleNode *_new_ag_node(Size size, ag_node_tag tag)
 {
     ExtensibleNode *n;
 
-    n = (ExtensibleNode *)palloc0fast(size);
+    n = (ExtensibleNode *)palloc0(size);
     n->type = T_ExtensibleNode;
     n->extnodename = node_names[tag];
 
diff --git a/src/backend/parser/cypher_analyze.c b/src/backend/parser/cypher_analyze.c
index 128acd0fb..d293df8b0 100644
--- a/src/backend/parser/cypher_analyze.c
+++ b/src/backend/parser/cypher_analyze.c
@@ -174,6 +174,8 @@ static bool convert_cypher_walker(Node *node, ParseState *pstate)
          * OpExpr - expression node for an operator invocation
          * Const - constant value or expression node
          * BoolExpr - expression node for the basic Boolean operators AND, OR, NOT
+         * JsonConstructorExpr - wrapper over FuncExpr/Aggref/WindowFunc for
+         *                       SQL/JSON constructors
          *
          * These are a special case that needs to be ignored.
          *
@@ -181,7 +183,8 @@ static bool convert_cypher_walker(Node *node, ParseState *pstate)
         if (IsA(funcexpr, SQLValueFunction)
                 || IsA(funcexpr, CoerceViaIO)
                 || IsA(funcexpr, Var)   || IsA(funcexpr, OpExpr)
-                || IsA(funcexpr, Const) || IsA(funcexpr, BoolExpr))
+                || IsA(funcexpr, Const) || IsA(funcexpr, BoolExpr)
+                || IsA(funcexpr, JsonConstructorExpr))
         {
             return false;
         }
@@ -346,6 +349,8 @@ static bool is_func_cypher(FuncExpr *funcexpr)
      * OpExpr - expression node for an operator invocation
      * Const - constant value or expression node
      * BoolExpr - expression node for the basic Boolean operators AND, OR, NOT
+     * JsonConstructorExpr - wrapper over FuncExpr/Aggref/WindowFunc for
+     *                       SQL/JSON constructors
      *
      * These are a special case that needs to be ignored.
      *
@@ -353,7 +358,8 @@ static bool is_func_cypher(FuncExpr *funcexpr)
     if (IsA(funcexpr, SQLValueFunction)
             || IsA(funcexpr, CoerceViaIO)
             || IsA(funcexpr, Var)   || IsA(funcexpr, OpExpr)
-            || IsA(funcexpr, Const) || IsA(funcexpr, BoolExpr))
+            || IsA(funcexpr, Const) || IsA(funcexpr, BoolExpr)
+            || IsA(funcexpr, JsonConstructorExpr))
     {
         return false;
     }
