CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration a (children 1)
    DataType UInt8
   ColumnDeclaration b (children 1)
    DataType String
   ColumnDeclaration c (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Float
   ColumnDeclaration date (children 1)
    DataType Date
 Storage definition (children 3)
  Function MergeTree
  Identifier date
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier a
    Identifier b
