CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType UInt32
   ColumnDeclaration json (children 1)
    DataType JSON
 Storage definition (children 2)
  Function MergeTree
  Function CAST (children 1)
   ExpressionList (children 2)
    Identifier json.a
    Literal \'Int64\'
