sstable: fix LazyFetcher lifetime #4137
Merged
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In #4123 we switched to allocating the fetcher lazily and restricting
the
valueBlockReader
lifetime to that of the iterator. However, thelifetime of the
*LazyFetcher
stored in the value must outlive theiterator and it currently lives inside
valueBlockReader
.This change fixes the bug by moving the
LazyFetcher
tovalueBlockFetcher
.Fixes #4131