CreateQuery tab2 (children 3)
 Identifier tab2
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a2 (children 1)
    DataType Int32
   ColumnDeclaration b2 (children 1)
    DataType Int32
 Storage definition (children 2)
  Function MergeTree
  Identifier a2