Exit early for STRING datatypes#84

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tetraptych wants to merge 3 commits intoTeradata:masterfrom

tetraptych:improve-conversion-times

Commits on Nov 13, 2017

Exit early for STRING datatypes
tetraptych
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Commits on Nov 15, 2017

Fix variable name
tetraptych
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Commits on Nov 16, 2017

Add Interval, JSON, Period typeCodes
tetraptych
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