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Cast column types with select() instead of withColumn() #396

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@rli602 rli602 commented Nov 8, 2021

Issue #, if available: N/A

Description of changes:
We're facing slowness while running the ColumnProfiler on large datasets. According to the PySpark's doc, using withColumn for multiple times, like in a for-loop, can cause performance issues. select() is suggested here to replace the multiple withColumn() call.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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