From f8fa4b16398527d219a0cc502577aaafc2791f96 Mon Sep 17 00:00:00 2001
From: thinkphp <thinkphp@qq.com>
Date: Wed, 20 Dec 2017 14:21:43 +0800
Subject: [PATCH] =?UTF-8?q?=E6=94=B9=E8=BF=9Bunion=E6=9F=A5=E8=AF=A2?=
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---
 library/think/db/Builder.php | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/library/think/db/Builder.php b/library/think/db/Builder.php
index d78193af..218b3d43 100644
--- a/library/think/db/Builder.php
+++ b/library/think/db/Builder.php
@@ -26,7 +26,7 @@ abstract class Builder
     protected $exp = ['eq' => '=', 'neq' => '<>', 'gt' => '>', 'egt' => '>=', 'lt' => '<', 'elt' => '<=', 'notlike' => 'NOT LIKE', 'not like' => 'NOT LIKE', 'like' => 'LIKE', 'in' => 'IN', 'exp' => 'EXP', 'notin' => 'NOT IN', 'not in' => 'NOT IN', 'between' => 'BETWEEN', 'not between' => 'NOT BETWEEN', 'notbetween' => 'NOT BETWEEN', 'exists' => 'EXISTS', 'notexists' => 'NOT EXISTS', 'not exists' => 'NOT EXISTS', 'null' => 'NULL', 'notnull' => 'NOT NULL', 'not null' => 'NOT NULL', '> time' => '> TIME', '< time' => '< TIME', '>= time' => '>= TIME', '<= time' => '<= TIME', 'between time' => 'BETWEEN TIME', 'not between time' => 'NOT BETWEEN TIME', 'notbetween time' => 'NOT BETWEEN TIME'];
 
     // SQL表达式
-    protected $selectSql    = 'SELECT%DISTINCT% %FIELD% FROM %TABLE%%FORCE%%JOIN%%WHERE%%GROUP%%HAVING%%ORDER%%LIMIT% %UNION%%LOCK%%COMMENT%';
+    protected $selectSql    = 'SELECT%DISTINCT% %FIELD% FROM %TABLE%%FORCE%%UNION%%JOIN%%WHERE%%GROUP%%HAVING%%ORDER%%LIMIT%%LOCK%%COMMENT%';
     protected $insertSql    = '%INSERT% INTO %TABLE% (%FIELD%) VALUES (%DATA%) %COMMENT%';
     protected $insertAllSql = '%INSERT% INTO %TABLE% (%FIELD%) %DATA% %COMMENT%';
     protected $updateSql    = 'UPDATE %TABLE% SET %SET% %JOIN% %WHERE% %ORDER%%LIMIT% %LOCK%%COMMENT%';
@@ -640,12 +640,12 @@ abstract class Builder
         unset($union['type']);
         foreach ($union as $u) {
             if ($u instanceof \Closure) {
-                $sql[] = $type . ' ' . $this->parseClosure($u, false);
+                $sql[] = $type . ' ' . $this->parseClosure($u);
             } elseif (is_string($u)) {
-                $sql[] = $type . ' ' . $this->parseSqlTable($u);
+                $sql[] = $type . ' (' . $this->parseSqlTable($u) . ')';
             }
         }
-        return implode(' ', $sql);
+        return ' ' . implode(' ', $sql);
     }
 
     /**