Fix perf issue in text format reader#3589

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BenjaminTrapani wants to merge 2 commits intomicrosoft:masterfrom BenjaminTrapani:user/betrapan/improve-text-reader-perf

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Commits on Mar 8, 2019

Cache previous parsed text sequence rows in memory to improve perf for large text files
BenjaminTrapani
committed

Commits on Mar 11, 2019

Convert tabs to spaces
BenjaminTrapani
authored