Fix outfuncs.c to dump A_Const nodes representing NULLs correctly. This has

been broken since forever, but was not noticed because people seldom look
at raw parse trees.  AFAIK, no impact on users except that debug_print_parse
might fail; but patch it all the way back anyway.  Per report from Jeff Ross.

diff --git a/src/backend/nodes/outfuncs.c b/src/backend/nodes/outfuncs.c
index 3e892eee10b40dd0a0f3663297990e5061e01e88..a830d27930f4f56d8852673582f2c1a52d32fbdf 100644 (file)
--- a/src/backend/nodes/outfuncs.c
+++ b/src/backend/nodes/outfuncs.c
@@ -1900,6 +1900,10 @@ _outValue(StringInfo str, Value *value)
                        /* internal representation already has leading 'b' */
                        appendStringInfoString(str, value->val.str);
                        break;
+               case T_Null:
+                       /* this is seen only within A_Const, not in transformed trees */
+                       appendStringInfoString(str, "NULL");
+                       break;
                default:
                        elog(ERROR, "unrecognized node type: %d", (int) value->type);
                        break;