read metadata in SimpleQueryableIndex if available to compute segment ordering#17181
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#16700 made
QueryableIndex.getMetadatabe 'lazy', which is kind of nice in some ways since we don't have to hang on to the segment metadata object unless we need it, however changes in #16533, #16849, and #16985 made it so that we read the segment "ordering" every time we make a cursor, which comes from the metadata, and seems pretty unchill with the lazy metadata reading.This PR makes it so that we precompute the ordering in
SimpleQueryableIndexconstructor so thatgetOrderingis a cheap call.