Add getPredicate() to PredicateEvaluator

[Jackie-Jiang]

Add getPredicate() to PredicateEvaluator interface for query explanation purpose

[siddharthteotia]

Do _predicate.getType() instead of function call (which although may not happen at runtime if JVM inlines) ?

[Jackie-Jiang]

It should be inlined when there is no other override on getPredicate(). It is slightly safer this way in case some class overrides the getPredicate()

[codecov-commenter]

Codecov Report

Merging #7840 (e9f209a) into master (dfb7fee) will increase coverage by 0.01%.
The diff coverage is 90.42%.

@@             Coverage Diff              @@
##             master    #7840      +/-   ##
============================================
+ Coverage     71.66%   71.67%   +0.01%     
+ Complexity     4088     4086       -2     
============================================
  Files          1579     1579              
  Lines         80851    80819      -32     
  Branches      12017    12017              
============================================
- Hits          57938    57930       -8     
+ Misses        19017    18995      -22     
+ Partials       3896     3894       -2     

Flag	Coverage Δ
integration1	29.47% <59.57%> (+0.01%)	⬆️
integration2	27.96% <59.57%> (+0.06%)	⬆️
unittests1	68.66% <89.36%> (-0.02%)	⬇️
unittests2	14.60% <0.00%> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...predicate/RegexpLikePredicateEvaluatorFactory.java	27.27% <50.00%> (-1.90%)	⬇️
.../filter/predicate/InPredicateEvaluatorFactory.java	78.26% <86.66%> (-1.54%)	⬇️
...lter/predicate/NotInPredicateEvaluatorFactory.java	79.20% <86.66%> (-1.35%)	⬇️
.../predicate/NotEqualsPredicateEvaluatorFactory.java	77.94% <87.50%> (-2.06%)	⬇️
...ter/predicate/EqualsPredicateEvaluatorFactory.java	83.33% <93.33%> (-1.92%)	⬇️
...lter/predicate/RangePredicateEvaluatorFactory.java	83.90% <94.11%> (+0.41%)	⬆️
...edicate/BaseDictionaryBasedPredicateEvaluator.java	50.00% <100.00%> (+2.00%)	⬆️
...rator/filter/predicate/BasePredicateEvaluator.java	75.00% <100.00%> (+25.00%)	⬆️
...predicate/BaseRawValueBasedPredicateEvaluator.java	86.56% <100.00%> (+0.20%)	⬆️
...icate/FSTBasedRegexpPredicateEvaluatorFactory.java	90.00% <100.00%> (ø)
... and 36 more

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