CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration json (children 1)
    DataType JSON
 Storage definition (children 3)
  Function AggregatingMergeTree
  Identifier id
  Set
