From 9ceb237dd6779e58047d112d051ab28b1002eb92 Mon Sep 17 00:00:00 2001
From: Deven Bansod <devenbansod.bits@gmail.com>
Date: Wed, 5 Oct 2016 17:38:23 +0530
Subject: [PATCH] Don't append FROM clause for replacing in UNION statements

If global statement has atleast one union, it should not have a FROM.

Fix #12619

Signed-off-by: Deven Bansod <devenbansod.bits@gmail.com>
---
 tbl_export.php | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/tbl_export.php b/tbl_export.php
index 542dfd9c84..740e2249fa 100644
--- a/tbl_export.php
+++ b/tbl_export.php
@@ -67,7 +67,9 @@ if (! empty($sql_query)) {
         }
 
         // Rebuilding the SELECT and FROM clauses.
-        if (count($parser->statements[0]->from) > 0) {
+        if (count($parser->statements[0]->from) > 0
+            && count($parser->statements[0]->union) === 0
+        ) {
             $replaces = array(
                 array(
                     'FROM', 'FROM ' . SqlParser\Components\ExpressionArray::build(