CreateQuery t_json_mutations (children 3)
 Identifier t_json_mutations
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration id (children 1)
    DataType UInt32
   ColumnDeclaration s (children 1)
    DataType String
   ColumnDeclaration obj (children 1)
    DataType JSON
 Storage definition (children 2)
  Function MergeTree
  Identifier id
