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[SPARK-19254][SQL] Support Seq, Map, and Struct in functions.lit
## What changes were proposed in this pull request? This pr is to support Seq, Map, and Struct in functions.lit; it adds a new IF named `lit2` with `TypeTag` for avoiding type erasure. ## How was this patch tested? Added tests in `LiteralExpressionSuite` Author: Takeshi Yamamuro <yamamuro@apache.org> Author: Takeshi YAMAMURO <linguin.m.s@gmail.com> Closes #16610 from maropu/SPARK-19254.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/literals.scala 11 additions, 1 deletion.../org/apache/spark/sql/catalyst/expressions/literals.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/LiteralExpressionSuite.scala 79 additions, 11 deletions...ark/sql/catalyst/expressions/LiteralExpressionSuite.scala
- sql/core/src/main/scala/org/apache/spark/sql/functions.scala 17 additions, 8 deletionssql/core/src/main/scala/org/apache/spark/sql/functions.scala
- sql/core/src/test/scala/org/apache/spark/sql/ColumnExpressionSuite.scala 14 additions, 0 deletions...st/scala/org/apache/spark/sql/ColumnExpressionSuite.scala
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