Replace nested Stream.concat with direct iteration in expression merging#6725

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RanVaknin wants to merge 2 commits intomasterfrom

rvaknin/ddb-optimization-updateExpression-stream-flattening

Commits on Feb 10, 2026

Replace nested Stream.concat with direct iteration in expression merging
RanVaknin
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Refactor merge function to only do one map lookup since put returns the previous value associated with key
RanVaknin
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