[SPARK-6638] [SQL] Improve performance of StringType in SQL#5350

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davies wants to merge 36 commits intoapache:masterfrom

Commits on Mar 31, 2015

use UTF8String instead of String for StringType
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cleanup
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use Array[Byte] in UTF8String
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fix utf8 for python api
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refactor
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Commits on Apr 1, 2015

fix style
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fix sql tests
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fix python sql tests
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fix some catalyst tests
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fix scala style
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fix codegen with UTF8String
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refactor
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Commits on Apr 2, 2015

fix some hive tests
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Merge branch 'master' of github.com:apache/spark into string
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fix hive tests
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convert data type for data source
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some comment about Date
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refactor
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Commits on Apr 3, 2015

Merge branch 'master' of github.com:apache/spark into string
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remove clone in UTF8String
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fix hive compatibility tests
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optimize UTF8String
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address comment
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add hashcode check back
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Merge branch 'master' of github.com:apache/spark into string
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Commits on Apr 4, 2015

fix String filter push down
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Commits on Apr 8, 2015

address comments from Yin
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rollback unrelated changes
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Commits on Apr 9, 2015

Merge branch 'master' of github.com:apache/spark into string
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Commits on Apr 10, 2015

add comment for getString/setString
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Commits on Apr 13, 2015

Merge branch 'master' of github.com:apache/spark into string
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turn off scala style check in UTF8StringSuite
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Commits on Apr 15, 2015

address comments from @marmbrus
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Merge branch 'master' of github.com:apache/spark into string
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fix new test failure
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fix schema of AddJar
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