[Kernel][Defaults] Support reading parquet files with legacy 3-level repeated types#3083
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vkorukanti
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scottsand-db
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…repeated types (#3083) ## Description When legacy mode is enabled in Spark, array physical types are stored slightly different from the standard format. Standard mode (default): ``` optional group readerFeatures (LIST) { repeated group list { optional binary element (STRING); } } ``` When write legacy mode is enabled (`spark.sql.parquet.writeLegacyFormat = true`): ``` optional group readerFeatures (LIST) { repeated group bag { optional binary array (STRING); } } ``` TODO: We need to handle the 2-level lists. Will post a separate PR. The challenge is with generating or finding the Parquet files with 2-level lists. ## How was this patch tested? Added tests Fixes #3082
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Description
When legacy mode is enabled in Spark, array physical types are stored slightly different from the standard format.
Standard mode (default):
When write legacy mode is enabled (
spark.sql.parquet.writeLegacyFormat = true):TODO: We need to handle the 2-level lists. Will post a separate PR. The challenge is with generating or finding the Parquet files with 2-level lists.
How was this patch tested?
Added tests
Fixes #3082