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[SPARK-12443][SQL] encoderFor should support Decimal
## What changes were proposed in this pull request? JIRA: https://issues.apache.org/jira/browse/SPARK-12443 `constructorFor` will call `dataTypeFor` to determine if a type is `ObjectType` or not. If there is not case for `Decimal`, it will be recognized as `ObjectType` and causes the bug. ## How was this patch tested? Test is added into `ExpressionEncoderSuite`. Author: Liang-Chi Hsieh <simonh@tw.ibm.com> Author: Liang-Chi Hsieh <viirya@gmail.com> Closes #10399 from viirya/fix-encoder-decimal.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala 1 addition, 0 deletions...scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/RowEncoder.scala 18 additions, 3 deletions...a/org/apache/spark/sql/catalyst/encoders/RowEncoder.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/types/Decimal.scala 8 additions, 0 deletions...t/src/main/scala/org/apache/spark/sql/types/Decimal.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/encoders/ExpressionEncoderSuite.scala 3 additions, 1 deletion.../spark/sql/catalyst/encoders/ExpressionEncoderSuite.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/encoders/RowEncoderSuite.scala 17 additions, 0 deletions.../apache/spark/sql/catalyst/encoders/RowEncoderSuite.scala
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