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[SPARK-18624][SQL] Implicit cast ArrayType(InternalType)
## What changes were proposed in this pull request? Currently `ImplicitTypeCasts` doesn't handle casts between `ArrayType`s, this is not convenient, we should add a rule to enable casting from `ArrayType(InternalType)` to `ArrayType(newInternalType)`. Goals: 1. Add a rule to `ImplicitTypeCasts` to enable casting between `ArrayType`s; 2. Simplify `Percentile` and `ApproximatePercentile`. ## How was this patch tested? Updated test cases in `TypeCoercionSuite`. Author: jiangxingbo <jiangxb1987@gmail.com> Closes #16057 from jiangxb1987/implicit-cast-complex-types.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala 39 additions, 18 deletions...org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala 3 additions, 3 deletions...cala/org/apache/spark/sql/catalyst/expressions/Cast.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/ApproximatePercentile.scala 6 additions, 13 deletions...atalyst/expressions/aggregate/ApproximatePercentile.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/Percentile.scala 4 additions, 10 deletions...spark/sql/catalyst/expressions/aggregate/Percentile.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercionSuite.scala 40 additions, 5 deletions...pache/spark/sql/catalyst/analysis/TypeCoercionSuite.scala
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