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Drill calcite1.4.0 rebase#8

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chunhui-shi wants to merge 3 commits intomapr:DrillCalcite1.4.0from
chunhui-shi:DrillCalcite1.4.0-rebase
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Drill calcite1.4.0 rebase#8
chunhui-shi wants to merge 3 commits intomapr:DrillCalcite1.4.0from
chunhui-shi:DrillCalcite1.4.0-rebase

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chunhui-shi and others added 3 commits February 3, 2017 17:23
…dynamic approach to expand schema tree when needed
Symptom is a hang in the test suite, with many threads in
ConventionTraitDef.getConversionData() and waiting to lock a WeakHashMap.
The solution is to replace the WeakHashMap with a LoadingCache, which is
thread-safe.
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