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