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| author | Sheamus K. Parkes <shea.parkes@milliman.com> | 2016-04-20 13:45:14 -0700 |
|---|---|---|
| committer | Davies Liu <davies.liu@gmail.com> | 2016-04-20 13:45:14 -0700 |
| commit | e7791c4f69aaa150e6ddb30b6d4ba2b0ea3c7807 (patch) | |
| tree | f2aea5c83cb65e37e4bd883fbd5b2155e14eeb5f /dev/lint-java | |
| parent | 7bc948557bb6169cbeec335f8400af09375a62d3 (diff) | |
| download | spark-e7791c4f69aaa150e6ddb30b6d4ba2b0ea3c7807.tar.gz spark-e7791c4f69aaa150e6ddb30b6d4ba2b0ea3c7807.tar.bz2 spark-e7791c4f69aaa150e6ddb30b6d4ba2b0ea3c7807.zip | |
[SPARK-13842] [PYSPARK] pyspark.sql.types.StructType accessor enhancements
## What changes were proposed in this pull request?
Expand the possible ways to interact with the contents of a `pyspark.sql.types.StructType` instance.
- Iterating a `StructType` will iterate its fields
- `[field.name for field in my_structtype]`
- Indexing with a string will return a field by name
- `my_structtype['my_field_name']`
- Indexing with an integer will return a field by position
- `my_structtype[0]`
- Indexing with a slice will return a new `StructType` with just the chosen fields:
- `my_structtype[1:3]`
- The length is the number of fields (should also provide "truthiness" for free)
- `len(my_structtype) == 2`
## How was this patch tested?
Extended the unit test coverage in the accompanying `tests.py`.
Author: Sheamus K. Parkes <shea.parkes@milliman.com>
Closes #12251 from skparkes/pyspark-structtype-enhance.
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