Fix InterpreterSelectWithUnionQuery::getCommonHeaderForUnion

dbms/src/Columns/getLeastSuperColumn.cpp

@@ -18,7 +18,7 @@ static bool sameConstants(const IColumn & a, const IColumn & b)
     return assert_cast<const ColumnConst &>(a).getField() == assert_cast<const ColumnConst &>(b).getField();
 }
 
-ColumnWithTypeAndName getLeastSuperColumn(std::vector<const ColumnWithTypeAndName *> columns)
+ColumnWithTypeAndName getLeastSuperColumn(const std::vector<const ColumnWithTypeAndName *> & columns)
 {
     if (columns.empty())
         throw Exception("Logical error: no src columns for supercolumn", ErrorCodes::LOGICAL_ERROR);

dbms/src/Columns/getLeastSuperColumn.h

@@ -7,6 +7,6 @@ namespace DB
 {
 
 /// getLeastSupertype + related column changes
-ColumnWithTypeAndName getLeastSuperColumn(std::vector<const ColumnWithTypeAndName *> columns);
+ColumnWithTypeAndName getLeastSuperColumn(const std::vector<const ColumnWithTypeAndName *> & columns);
 
 }

dbms/src/Interpreters/InterpreterSelectWithUnionQuery.cpp

@@ -126,7 +126,7 @@ Block InterpreterSelectWithUnionQuery::getCommonHeaderForUnion(const Blocks & he
                             ErrorCodes::UNION_ALL_RESULT_STRUCTURES_MISMATCH);
     }
 
-    std::vector<const ColumnWithTypeAndName *> columns(num_columns);
+    std::vector<const ColumnWithTypeAndName *> columns(num_selects);
 
     for (size_t column_num = 0; column_num < num_columns; ++column_num)
     {