cache JsonPaths to prevent compilation per segment

[richardstartin]

This prevents compiling a JsonPath for each queried segment.

[codecov-commenter]

Codecov Report

Merging #7826 (c77175c) into master (90f5881) will decrease coverage by 6.47%.
The diff coverage is 81.81%.

@@             Coverage Diff              @@
##             master    #7826      +/-   ##
============================================
- Coverage     71.66%   65.19%   -6.48%     
+ Complexity     4089     4086       -3     
============================================
  Files          1579     1534      -45     
  Lines         80832    78969    -1863     
  Branches      12010    11807     -203     
============================================
- Hits          57932    51483    -6449     
- Misses        19001    23824    +4823     
+ Partials       3899     3662     -237     

Flag	Coverage Δ
integration1	?
integration2	?
unittests1	68.67% <81.81%> (+0.02%)	⬆️
unittests2	14.59% <0.00%> (-0.02%)	⬇️

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

Impacted Files	Coverage Δ
...rg/apache/pinot/common/function/JsonPathCache.java	78.57% <77.77%> (-21.43%)	⬇️
...form/function/JsonExtractKeyTransformFunction.java	73.91% <100.00%> (-4.35%)	⬇️
...m/function/JsonExtractScalarTransformFunction.java	43.80% <100.00%> (-5.72%)	⬇️
...a/org/apache/pinot/common/metrics/MinionMeter.java	0.00% <0.00%> (-100.00%)	⬇️
...g/apache/pinot/common/metrics/ControllerMeter.java	0.00% <0.00%> (-100.00%)	⬇️
.../apache/pinot/common/metrics/BrokerQueryPhase.java	0.00% <0.00%> (-100.00%)	⬇️
.../apache/pinot/common/metrics/MinionQueryPhase.java	0.00% <0.00%> (-100.00%)	⬇️
...he/pinot/common/messages/SegmentReloadMessage.java	0.00% <0.00%> (-100.00%)	⬇️
...pinot/core/data/manager/realtime/TimerService.java	0.00% <0.00%> (-100.00%)	⬇️
...pinot/minion/exception/TaskCancelledException.java	0.00% <0.00%> (-100.00%)	⬇️
... and 357 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 90f5881...c77175c. Read the comment docs.

[Jackie-Jiang]

LGTM