[SPARK-19446][SQL] Remove unused findTightestCommonType in TypeCoercion#16786
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HyukjinKwon wants to merge 1 commit intoapache:masterfrom
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[SPARK-19446][SQL] Remove unused findTightestCommonType in TypeCoercion#16786HyukjinKwon wants to merge 1 commit intoapache:masterfrom
HyukjinKwon wants to merge 1 commit intoapache:masterfrom
