[Tarantool-patches] [PATCH 0/2] reduce performance degradation introduced by JSON path indices

[Serge Petrenko]

The patchset fixes two degradations found by measuring snapshot recovery time
for a 1.5G snapshot containing 30M tuples in a memtx space with a simple primary
key and one secondary key over 4 integer and one string field.

The first degradation manifests itself during snapshot recovery phase (the one
with "3.5M rows processed" messages) and is connected to `memtx_tuple_new`
slowdown due to unoptimised `tuple_field_map_create`.

First patch deals with this degradation and manages to restore almost all
performance lost since 1.10. (The patched version is only 11% slower than 1.10,
while the current master is 39% slower on this phase).

The second degradation appears during next snapshot recovery phase, secondary
index building. Here the degradation is rooted in slow tuple field access via
tuple_field_raw().

The second patch deals with this issue and manages to restore part of the lost
performance. (The patched version is 14% slower than 1.10 while the current
master is 27% slower).

Serge Petrenko (2):
  box: speed up tuple_field_map_create
  box: use tuple_field_raw_by_part where possible

 src/box/tuple_compare.cc     | 37 ++++-----------
 src/box/tuple_extract_key.cc | 10 +---
 src/box/tuple_format.c       | 91 ++++++++++++++++++++++++++++++++++++
 src/box/tuple_hash.cc        | 35 ++++----------
 4 files changed, 111 insertions(+), 62 deletions(-)

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