[cherry-pick][release-2.40.0][Fixes #21927] Compress (Un)BoundedSourceAsSdfWrapper element and restriction coders #21936
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…n)BoundedSourceAsSdfWrapper element and restriction coders * [Fixes apache#21927] Compress BoundedSourceAsSdfWrapper element and restriction coders A typical BoundedSource may be split into many BoundedSource instances during initial splitting. Doing a simple test of the BigtableSource shows that encoding 10 instances after splitting took on average 102660 bytes while compressing each instance separately after encoding took 1639 bytes for a >60x improvement. * Also handle unbounded sources.
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…rceAsSdfWrapper element and restriction coders
Cherry-pick of #21928
A typical BoundedSource may be split into many BoundedSource instances during initial splitting. Doing a simple test of the BigtableSource shows that encoding 10 instances after splitting took on average 102660 bytes while compressing each instance separately after encoding took 1639 bytes for a >60x improvement.
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