CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration json (children 1)
    DataType JSON
   ColumnDeclaration a (children 2)
    DataType UInt32
    Function CAST (children 1)
     ExpressionList (children 2)
      Identifier json.a
      Literal \'UInt32\'
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList
