CreateQuery optimize_sorting (children 3)
 Identifier optimize_sorting
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration a (children 1)
    DataType UInt64
   ColumnDeclaration b (children 1)
    DataType UInt64
   ColumnDeclaration c (children 1)
    DataType UInt64
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier a
    Identifier b
