Add IncrementMetric expression #1828
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Description
This change introduces a new expression
IncrementMetricto support the frequent use case of incrementing metrics in Merge, Update and Delete. It replaces the use of UDFs to achieve that goal.How was this patch tested?
Added IncrementMetricSuite to cover usage of the newly introduced expression.
Metrics correctness is covered in existing test suites
MergeIntoMetricsBase,UpdateMetricsSuiteandDeleteMetricsSuite.