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[SPARK-17331][CORE][MLLIB] Avoid allocating 0-length arrays
## What changes were proposed in this pull request? Avoid allocating some 0-length arrays, esp. in UTF8String, and by using Array.empty in Scala over Array[T]() ## How was this patch tested? Jenkins Author: Sean Owen <sowen@cloudera.com> Closes #14895 from srowen/SPARK-17331.
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- common/unsafe/src/main/java/org/apache/spark/unsafe/types/UTF8String.java 4 additions, 4 deletions...c/main/java/org/apache/spark/unsafe/types/UTF8String.java
- core/src/main/scala/org/apache/spark/MapOutputTracker.scala 2 additions, 2 deletionscore/src/main/scala/org/apache/spark/MapOutputTracker.scala
- core/src/main/scala/org/apache/spark/rdd/ZippedWithIndexRDD.scala 1 addition, 1 deletion.../main/scala/org/apache/spark/rdd/ZippedWithIndexRDD.scala
- docs/streaming-kafka-0-8-integration.md 1 addition, 1 deletiondocs/streaming-kafka-0-8-integration.md
- mllib-local/src/main/scala/org/apache/spark/ml/linalg/Matrices.scala 3 additions, 3 deletions.../src/main/scala/org/apache/spark/ml/linalg/Matrices.scala
- mllib/src/main/scala/org/apache/spark/ml/classification/MultinomialLogisticRegression.scala 1 addition, 1 deletion...ark/ml/classification/MultinomialLogisticRegression.scala
- mllib/src/main/scala/org/apache/spark/ml/feature/OneHotEncoder.scala 2 additions, 2 deletions...ain/scala/org/apache/spark/ml/feature/OneHotEncoder.scala
- mllib/src/main/scala/org/apache/spark/mllib/linalg/Matrices.scala 3 additions, 3 deletions...c/main/scala/org/apache/spark/mllib/linalg/Matrices.scala
- mllib/src/main/scala/org/apache/spark/mllib/stat/test/ChiSqTest.scala 1 addition, 1 deletion...in/scala/org/apache/spark/mllib/stat/test/ChiSqTest.scala
- sql/catalyst/src/main/java/org/apache/spark/sql/types/DataTypes.java 1 addition, 1 deletion...t/src/main/java/org/apache/spark/sql/types/DataTypes.java
- sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala 1 addition, 1 deletion...ache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala
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