CreateQuery test (children 3)
 Identifier test
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration t (children 1)
    DataType Tuple (children 1)
     ExpressionList (children 2)
      NameTypePair a (children 1)
       DataType LowCardinality (children 1)
        ExpressionList (children 1)
         DataType String
      NameTypePair json (children 1)
       DataType JSON
 Storage definition (children 3)
  Function CoalescingMergeTree
  Identifier id
  Set
