CreateQuery t_optimize_level (children 3)
 Identifier t_optimize_level
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType UInt64
   ColumnDeclaration b (children 1)
    DataType UInt64
 Storage definition (children 3)
  Function ReplacingMergeTree
  Identifier a
  Set
