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9b51b2b6e6
This patch introduces a new query option, PARQUET_FALLBACK_SCHEMA_RESOLUTION which allows Parquet files' schemas to be resolved by either name or position. It's "fallback" because eventually field IDs will be the primary schema resolution scheme, and we don't want to create an option that we will have to change the name of later. The default is still by position. I chose to do a query option because it will make testing easier and also be easier to diagnose resolution problems quickly in the field. If users want to switch the default behavior to be by name (like Hive), they can use the --default_query_options flag. This patch also introduces a new test section, SHELL, which can be used to execute shell commands in a .test file. This is useful for copying files into test tables. Change-Id: Id0c715ea23792b2a6872610839a40532aabbb5a6 Reviewed-on: http://gerrit.cloudera.org:8080/2384 Reviewed-by: Skye Wanderman-Milne <skye@cloudera.com> Tested-by: Internal Jenkins
switched_map.parq was generated by modifying parquet-mr to switch the key and value fields
of map, and then converting switched_map.json to parquet using switched_map.avsc as the
schema. switched_map.parq has the following schema according to parquet-tools:
message com.cloudera.impala.switched_map {
required group int_map (MAP) {
repeated group map (MAP_KEY_VALUE) {
required int32 value;
required binary key (UTF8);
}
}
}