[SPARK-6195] [SQL] Adds in-memory column type for fixed-precision decimals#4938

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liancheng:decimal-column-type

Commits on Mar 7, 2015

Adds in-memory column type for fixed-precision decimals
liancheng
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Commits on Mar 9, 2015

Only resorts to FIXED_DECIMAL when the value can be held in a long
liancheng
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Commits on Mar 14, 2015

Updates fixed decimal column type related test cases
liancheng
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