CreateQuery mv_extra_columns_src (children 3)
 Identifier mv_extra_columns_src
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration v1 (children 1)
    DataType UInt64
   ColumnDeclaration v2 (children 1)
    DataType UInt64
 Storage definition (children 1)
  Function Null
