hotfix for allow_experimental_multiple_joins_emulation

ClickHouse · Feb 1, 2019 · 52de2cd · 52de2cd
1 parent 2b8c30a
commit 52de2cd
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diff --git a/dbms/src/Interpreters/JoinToSubqueryTransformVisitor.cpp b/dbms/src/Interpreters/JoinToSubqueryTransformVisitor.cpp
@@ -59,6 +59,9 @@ struct RewriteTablesVisitorData
 
 static bool needRewrite(ASTSelectQuery & select)
 {
+    if (!select.tables)
+        return false;
+
     auto tables = typeid_cast<const ASTTablesInSelectQuery *>(select.tables.get());
     if (!tables)
         return false;

diff --git a/dbms/tests/queries/0_stateless/00820_multiple_joins.sql b/dbms/tests/queries/0_stateless/00820_multiple_joins.sql
@@ -17,6 +17,8 @@ INSERT INTO table5 SELECT number * 5, number * 50, number * 500 FROM numbers(10)
 
 SET allow_experimental_multiple_joins_emulation = 1;
 
+SELECT 1 LIMIT 0;
+
 -- FIXME: wrong names qualification
 select a, b, c from table1 as t1 join table2 as t2 on t1.a = t2.a join table3 as t3 on b = t3.b;
 select a, b, c from table1 as t1 join table2 as t2 on t1.a = t2.a join table5 as t5 on a = t5.a AND b = t5.b;