DRILL-4332: Makes vector comparison order stable in test framework #389
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In the test framework, a vector is a map of <String, Object>. When comparing actual values with baseline, the comparison is made column by column, but a HashMap key ordering is not guaranteed, and the ordering actually changed between Java7 and Java8 in Oracle/OpenJDK. Replacing HashMap with TreeMap which has a guaranteed ordering by design.
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In the test framework, a vector is a map of <String, Object>. When comparing
actual values with baseline, the comparison is made column by column, but
a HashMap key ordering is not guaranteed, and the ordering actually changed
between Java7 and Java8 in Oracle/OpenJDK.
Replacing HashMap with TreeMap which has a guaranteed ordering by design.