[BEAM-14429] Fix SyntheticUnboundedSource data duplication with SDF wrapper

[y1chi]

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[y1chi]

R: @chamikaramj

[y1chi]

R: @lukecwik

[chamikaramj]

Thanks. LGTM.

May be fix the wording of the following log as well (it logs splits not sizes of splits).

beam/sdks/java/io/synthetic/src/main/java/org/apache/beam/sdk/io/synthetic/SyntheticUnboundedSource.java

Line 112 in 5c21fbc

LOG.info("Split into {} bundles of sizes: {}", splits.size(), splits);

[y1chi]

Run Kotlin_Examples PreCommit

[y1chi]

Run Java PreCommit

[lukecwik]

Just make sure that this change won't break the update compatibility tests or change the encoding to be current+end instead of start+end

[chamikaramj]

Thanks. LGTM.

[y1chi]

Just make sure that this change won't break the update compatibility tests or change the encoding to be current+end instead of start+end

I believe update compatibility test pipeline doesn't involve this source directly.

[lukecwik]

Just make sure that this change won't break the update compatibility tests or change the encoding to be current+end instead of start+end

I believe update compatibility test pipeline doesn't involve this source directly.

Great.

[lukecwik]

a test that shows the incorrect behavior is fixed?

Merging as is for the fix.