Make PDO split-by coherent with other DB split-by with service name flattening

[pablomartinezbernardo]

Split by should take priority in PDO integration over service name flattening

Fixes #2519.

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-02-19 16:53:03

Comparing candidate commit f5c6e88 in PR branch pmartinez/pdo-split-bugfix with baseline commit 09cb82a in branch master.

Some scenarios are present only in baseline or only in candidate runs. If you didn't create or remove some scenarios in your branch, this maybe a sign of crashed benchmarks 💥💥💥
Check Gitlab CI job log to find if any benchmark has crashed.

Scenarios present only in baseline:

• BM_TeaSapiSpinup
• BM_TeaSapiSpindown

Found 0 performance improvements and 1 performance regressions! Performance is the same for 42 metrics, 49 unstable metrics.

scenario:SamplingRuleMatchingBench/benchRegexMatching4

• 🟥 execution_time [+255.119ns; +661.781ns] or [+4.190%; +10.869%]

[bwoebi]

Thanks, looks good to me :-)