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[SPARK-16922] [SPARK-17211] [SQL] make the address of values portable…
… in LongToUnsafeRowMap ## What changes were proposed in this pull request? In LongToUnsafeRowMap, we use offset of a value as pointer, stored in a array also in the page for chained values. The offset is not portable, because Platform.LONG_ARRAY_OFFSET will be different with different JVM Heap size, then the deserialized LongToUnsafeRowMap will be corrupt. This PR will change to use portable address (without Platform.LONG_ARRAY_OFFSET). ## How was this patch tested? Added a test case with random generated keys, to improve the coverage. But this test is not a regression test, that could require a Spark cluster that have at least 32G heap in driver or executor. Author: Davies Liu <[email protected]> Closes #14927 from davies/longmap. (cherry picked from commit f7e26d7) Signed-off-by: Davies Liu <[email protected]>
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