Avoid duplicate warning on nonstandard escaping of strings

pg_store_plans emits duplicate warning with core parser for each
nonstandard string escape in expressions of a query. This commit stops
that.

diff --git a/pgsp_json.c b/pgsp_json.c
index c39931f..9de20b0 100644 (file)
--- a/pgsp_json.c
+++ b/pgsp_json.c
@@ -442,6 +442,13 @@ normalize_expr(char *expr, bool preserve_space)
                                                         ScanKeywords,
                                                         NumScanKeywords);
 
+       /*
+        * The warnings about nonstandard escape strings is already emitted in the
+        * core. Just silence them here.
+        */
+#if PG_VERSION_NUM >= 90500
+       yyextra.escape_string_warning = false;
+#endif
        lasttok = 0;
        lastloc = -1;