CreateQuery tab3 (children 3)
 Identifier tab3
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a3 (children 1)
    DataType Int32
   ColumnDeclaration b3 (children 1)
    DataType Int32
 Storage definition (children 2)
  Function MergeTree
  Identifier a3