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[SPARK-12201][SQL] add type coercion rule for greatest/least
checked with hive, greatest/least should cast their children to a tightest common type, i.e. `(int, long) => long`, `(int, string) => error`, `(decimal(10,5), decimal(5, 10)) => error` Author: Wenchen Fan <wenchen@databricks.com> Closes #10196 from cloud-fan/type-coercion.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala 14 additions, 0 deletions...apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/ExpressionTypeCheckingSuite.scala 10 additions, 0 deletions...k/sql/catalyst/analysis/ExpressionTypeCheckingSuite.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercionSuite.scala 23 additions, 0 deletions...e/spark/sql/catalyst/analysis/HiveTypeCoercionSuite.scala
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