CreateQuery tab2 (children 3)
 Identifier tab2
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration x (children 1)
    DataType DateTime
   ColumnDeclaration y (children 1)
    DataType UInt32
   ColumnDeclaration z (children 1)
    DataType UInt32
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier x
    Identifier y
