CreateQuery test (children 3)
 Identifier test
 Columns definition (children 2)
  ExpressionList (children 1)
   ColumnDeclaration x (children 1)
    DataType String
  ExpressionList (children 1)
   Index (children 2)
    Identifier x
    Function ngrambf_v1 (children 1)
     ExpressionList (children 4)
      Literal UInt64_4
      Literal UInt64_16000
      Literal UInt64_2
      Literal UInt64_0
 Storage definition (children 3)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
  Set
