Implement logarithmic index:count in the memtx tree
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The method is used in order to skip the specified amount of tuples when selecting with an offset. NO_DOC=internal NO_TEST=covered already NO_CHANGELOG=internal
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This commit introduces a new `fast_offset` option of index. It means to enable the acceleration of select with offset in an index if it supports that (currently none of indexes do). NO_DOC=see the next commit NO_CHANGELOG=see the next commit
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This patch makes the memtx tree index create different trees depending on the `fast_offset` index option. This is the first step towards the logarithmic select and iteration with offset and count implementation. NO_DOC=see the next commit NO_CHANGELOG=see the next commit
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index:count in the memtx tree
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This patch creates a specialized implementation for `count` tree index method, which takes advantage of offset-based functions of the BPS tree with BPS_INNER_CARD config. In order to handle keys and iterators consistently with `select`, the iterator creation and key lookup algorithms had been refactored into separated functions. NO_DOC=see the next commit NO_CHANGELOG=see the next commit
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Part of #8204