fix(cursor, fetch_dataframe): use column names in cursor's description as is #239
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…n as is Previously, the Cursor.fetch_dataframe method lowercased column names preemptively, thus not respecting the active case-sensitivity configuration value. This could lead to issues, when e.g. two different columns resolved to the same name when lowercased. This commit ensures the resulting DataFrame's columns are the same as the ones in the cursor's description, thus reflecting Redshift's behavior and respecting the underlying case-sensitivity configuration.
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Previously, the
Cursor.fetch_dataframemethod lowercased column names preemptively, thus not respecting the case-sensitivity configuration value. This could lead to issues, when e.g. two different columns resolved to the same name when lowercased.This PR fixes the issue by ensuring the resulting
DataFrame's columns are the same as the ones in the cursor'sdescriptionattribute, thus making the driver match Redshift's behavior.Motivation and Context
Fixes #238
Testing
Implemented a unit test that demonstrates how
fetch_dataframepreserves the column names as they appear in the cursor'sdescriptionattribute.After making the change, I ran
python -m pytest test/unitin a fresh environment and observed all tests succeeding:Types of changes
Checklist
./build.shsucceedspytest test/unitand they are passing.License