Fix auto-explain JSON output to be valid JSON.

Problem reported by Peter Eisentraut.

Backpatched to release 9.0.

diff --git a/contrib/auto_explain/auto_explain.c b/contrib/auto_explain/auto_explain.c
index b3206987484e57a91850033fef01bc9c507172e9..3ebc3b298e31d202dfc089bbd4c5a552f85b04af 100644 (file)
--- a/contrib/auto_explain/auto_explain.c
+++ b/contrib/auto_explain/auto_explain.c
@@ -282,6 +282,13 @@ explain_ExecutorEnd(QueryDesc *queryDesc)
                        if (es.str->len > 0 && es.str->data[es.str->len - 1] == '\n')
                                es.str->data[--es.str->len] = '\0';
 
+                       /* Fix JSON to output an object */
+                       if (auto_explain_log_format == EXPLAIN_FORMAT_JSON)
+                       {
+                               es.str->data[0] = '{';
+                               es.str->data[es.str->len - 1] = '}';
+                       }
+
                        /*
                         * Note: we rely on the existing logging of context or
                         * debug_query_string to identify just which statement is being