CreateQuery join_table_1 (children 3)
 Identifier join_table_1
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a_id (children 1)
    DataType Int64
   ColumnDeclaration b_id (children 1)
    DataType Int64
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier a_id
    Identifier b_id
