[GOBBLIN-849] Connect to Oracle using service name, update metadata query

[ssnarvekar01]

…data query for OracleExtractor

Dear Gobblin maintainers,

Please accept this PR. I understand that it will not be reviewed until I have checked off all the steps below!

JIRA

• My PR addresses the following Gobblin JIRA issues and references them in the PR title. For example, "[GOBBLIN-XXX] My Gobblin PR"
  • https://issues.apache.org/jira/browse/GOBBLIN-849

Description

• Here are some details about my PR, including screenshots (if applicable):
  Improvement: Enable connection to oracle using service name
  Bug Fix: Update metadata fetch query in OracleExtractor which was failing when we provide owner and table_name in lower case through job config file.

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:

Commits

• My commits all reference JIRA issues in their subject lines, and I have squashed multiple commits if they address the same issue. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

[codecov-io]

Codecov Report

Merging #2705 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master    #2705      +/-   ##
============================================
- Coverage      44.9%   44.88%   -0.02%     
+ Complexity     8713     8709       -4     
============================================
  Files          1879     1879              
  Lines         70079    70083       +4     
  Branches       7703     7706       +3     
============================================
- Hits          31466    31454      -12     
- Misses        35702    35719      +17     
+ Partials       2911     2910       -1

Impacted Files	Coverage Δ	Complexity Δ
...pache/gobblin/configuration/ConfigurationKeys.java	0% <ø> (ø)	0 <0> (ø)	⬇️
...rg/apache/gobblin/source/jdbc/OracleExtractor.java	43.83% <0%> (-1.24%)	7 <0> (ø)
...bblin/cluster/GobblinHelixJobLauncherListener.java	70% <0%> (-30%)	3% <0%> (-2%)
...lin/util/filesystem/FileSystemInstrumentation.java	85.71% <0%> (-7.15%)	3% <0%> (ø)
.../gobblin/cluster/HelixRetriggeringJobCallable.java	60.41% <0%> (-3.48%)	9% <0%> (ø)
...ache/gobblin/couchbase/writer/CouchbaseWriter.java	66.27% <0%> (-2.33%)	11% <0%> (ø)
...pache/gobblin/cluster/GobblinHelixJobLauncher.java	81.25% <0%> (-2.09%)	26% <0%> (-2%)
...ache/gobblin/cluster/GobblinHelixJobScheduler.java	39.21% <0%> (-1.31%)	6% <0%> (ø)
...in/java/org/apache/gobblin/cluster/HelixUtils.java	41.83% <0%> (ø)	13% <0%> (-1%)	⬇️
.../org/apache/gobblin/cluster/GobblinTaskRunner.java	66.19% <0%> (+0.46%)	29% <0%> (ø)	⬇️
... and 2 more

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[jhsenjaliya]

+1, LGTM

[sv2000]

Replace with if (!Strings.isNullOrEmpty(sid)) ?

[sv2000]

Replace "conn" with "serviceString" or something more meaningful?