[DOP-22350] Add transformations for Transfers with dataframe column filtering #186
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Change Summary
Added a schema for
DataframeColumnsFilter
transformation:Supported filter types:
include
rename
cast
Implemented logic in the worker to handle DataframeColumnsFilter transformations: if a filter is present, it is applied to DBReader(columns=['"col1"', '"col2" AS "new_col2"', 'CAST("col3" as DATE) AS "col3"']) for DBHandler types and df.selectExpr("...") for FileHandlers. Filters are converted into a single SQL-like condition using AND, e.g.,
Checklist
docs/changelog/next_release/<pull request or issue id>.<change type>.rst
file added describing change(see CONTRIBUTING.rst for details.)