Currently collections and structs are supported in the select list, also
when they are nested (structs in structs and collections in
collections), but mixing different kinds of complex types, i.e. having
structs in collections or vice versa, is not supported.
This patch adds support for mixed complex types in the select list.
Limitation: zipping unnest is not supported for mixed complex types, for
example the following query:
use functional_parquet;
select unnest(struct_contains_nested_arr.arr) from
collection_struct_mix;
Testing:
- Created a new test table, 'collection_struct_mix', that contains
mixed complex types.
- Added tests in mixed-collections-and-structs.test that test having
mixed complex types in the select list. These tests are called from
test_nested_types.py::TestMixedCollectionsAndStructsInSelectList.
- Ran existing tests that test collections and structs in the select
list; test queries that expected a failure in case of mixed complex
types have been moved to mixed-collections-and-structs.test and now
expect success.
Change-Id: I476d98884b5fd192dfcd4feeec7947526aebe993
Reviewed-on: http://gerrit.cloudera.org:8080/19322
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Impala allows non-string types, for example numbers, to be keys in maps.
We print maps as json objects, but json objects only allow string keys.
If the Impala map has for example an INT key, the printed json is
invalid.
For example, in Impala the following two maps are not the same:
{1: "a", 2: "b"}
{"1": "a", "2": "b"}
The first map has INT keys, the second has STRING keys. Only the second
one is valid json.
Hive has the same behaviour as Impala, i.e. it produces invalid json if
the map keys have a non-string type.
This change introduces the STRINGIFY_MAP_KEYS query option that, when
set to true, converts non-string keys to strings. The default value of
the new query option is false because
- conversion to string causes loss of information and
- setting it to true would be a breaking change.
Testing:
- Added tests in nested-map-in-select-list.test and map_null_keys.test
that check the behaviour when STRINGIFY_MAP_KEYS is set to true.
Change-Id: I1820036a1c614c34ae5d70ac4fe79a992c9bce3a
Reviewed-on: http://gerrit.cloudera.org:8080/19364
Reviewed-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
We have been using rapidjson to print structs but didn't use it to print
collections (arrays and maps).
This change introduces the usage of rapidjson to print collections for
both the HS2 and the Beeswax protocol.
The old code handling the printing of collections in raw-value.{h,cc} is
removed.
Testing:
- Ran existing EE tests
- Added EE tests with non-string and NULL map keys in
nested-map-in-select-list.test and map_null_keys.test.
Change-Id: I08a2d596a498fbbaf1419b18284846b992f49165
Reviewed-on: http://gerrit.cloudera.org:8080/19309
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com>
Reviewed-by: Daniel Becker <daniel.becker@cloudera.com>
