Add position() function to PPL

[margarit-h]

Signed-off-by: Margarit Hakobyan margarith@bitquilltech.com

Description

Usage: The syntax POSITION(substr IN str) returns the position of the first occurrence of substring substr in string str. Returns 0 if substr is not in str. Returns NULL if any argument is NULL.

Argument type: STRING, STRING

Return type integer:

(STRING IN STRING) -> INTEGER

Example::

opensearchsql> source=location | eval `POSITION('world' IN 'helloworld')` = POSITION('world' IN 'helloworld'), `POSITION('invalid' IN 'helloworld')`= POSITION('invalid' IN 'helloworld')  | fields `POSITION('world' IN 'helloworld')`, `POSITION('invalid' IN 'helloworld')`;
fetched rows / total rows = 2/2
+-------------------------------------+---------------------------------------+
| POSITION('world' IN 'helloworld')   | POSITION('invalid' IN 'helloworld')   |
|-------------------------------------+---------------------------------------|
| 6                                   | 0                                     |
| 6                                   | 0                                     |
+-------------------------------------+---------------------------------------+

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Merging #179 (8227419) into integ-add-position-to-ppl (c276efc) will decrease coverage by 2.50%.
The diff coverage is 100.00%.

@@                       Coverage Diff                       @@
##             integ-add-position-to-ppl     #179      +/-   ##
===============================================================
- Coverage                        98.30%   95.79%   -2.51%     
- Complexity                        3473     3474       +1     
===============================================================
  Files                              348      358      +10     
  Lines                             8668     9330     +662     
  Branches                           549      668     +119     
===============================================================
+ Hits                              8521     8938     +417     
- Misses                             142      334     +192     
- Partials                             5       58      +53     

Flag	Coverage Δ
query-workbench	62.76% <ø> (?)
sql-engine	98.30% <100.00%> (+<0.01%)	⬆️

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

Impacted Files	Coverage Δ
...pensearch/sql/ppl/parser/AstExpressionBuilder.java	100.00% <100.00%> (ø)
workbench/public/components/Header/Header.tsx	100.00% <0.00%> (ø)
...ch/public/components/QueryResults/QueryResults.tsx	61.60% <0.00%> (ø)
workbench/public/components/Main/main.tsx	53.00% <0.00%> (ø)
...h/public/components/QueryLanguageSwitch/Switch.tsx	85.71% <0.00%> (ø)
workbench/public/components/SQLPage/SQLPage.tsx	100.00% <0.00%> (ø)
workbench/public/components/app.tsx	0.00% <0.00%> (ø)
workbench/public/utils/PanelWrapper.tsx	100.00% <0.00%> (ø)
...ublic/components/QueryResults/QueryResultsBody.tsx	68.32% <0.00%> (ø)
workbench/public/application.tsx	0.00% <0.00%> (ø)
... and 1 more

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[acarbonetto]

Return type: INTEGER