FilteringPrimitiveConverter should support dictionaries
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描述
If the delegated PrimitiveConverter supports dictionaries, then FilteringPrimitiveConverter should too.
**Reporter**: [Alex Levenson](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=alexlevenson) / @isnotinvain
**Note**: *This issue was originally created as [PARQUET-36](https://issues.apache.org/jira/browse/PARQUET-36). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*
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调研方向
Locate FilteringPrimitiveConverter and the delegated PrimitiveConverter it wraps, then inspect how dictionary support is handled. Confirm the converter supports dictionaries whenever its delegate does, and verify the behavior with the relevant existing converter tests.
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