db: avoid keyspanimpl.TableNewSpanIter closure allocation #3584
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The tableNewIters func requires a context, but the keyspanimpl.TableNewSpanIter func used by keyspan.LevelIter did not take one. This required iterator construction to close over the context and the tableNewIters to create an keyspanimpl.TableNewSpanIter, forcing an allocation. This commit refactors the keyspanimpl.LevelIter to embed a context, like the point iterator's levelIter, and propagate the context into TableNewSpanIter through an argument.
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The tableNewIters func requires a context, but the keyspanimpl.TableNewSpanIter func used by keyspan.LevelIter did not take one. This required iterator construction to close over the context and the tableNewIters to create an keyspanimpl.TableNewSpanIter, forcing an allocation.
This commit refactors the keyspanimpl.LevelIter to embed a context, like the point iterator's levelIter, and propagate the context into TableNewSpanIter through an argument.