[SPARK-26979][PYTHON] Add missing string column name support for some SQL functions#23882

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asmello wants to merge 4 commits intoapache:masterfrom

asmello:col-name-support-pyspark

Commits on Feb 24, 2019

Add missing column name support, fix redefinition of function
amello-palantir
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Add remaining string/binary functions missing colname support
amello-palantir
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Commits on Mar 2, 2019

Revert previous changes, intro new func generator
amello-palantir
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Commits on Mar 4, 2019

Add/update comments and docs for clarification
amello-palantir
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