Add support for partial TOAST decompression When asked for a slice of a TOAST entry, decompress enough to return the slice instead of decompressing the entire object.
For use cases where the slice is at, or near, the beginning of the entry, this avoids a lot of unnecessary decompression work. This changes the signature of pglz_decompress() by adding a boolean to indicate if it's ok for the call to finish before consuming all of the source or destination buffers. Author: Paul Ramsey Reviewed-By: Rafia Sabih, Darafei Praliaskouski, Regina Obe Discussion: https://postgr.es/m/CACowWR07EDm7Y4m2kbhN_jnys%3DBBf9A6768RyQdKm_%3DNpkcaWg%40mail.gmail.com Branch ------ master Details ------- https://git.postgresql.org/pg/commitdiff/4d0e994eed83c845a05da6e9a417b4efec67efaf Modified Files -------------- src/backend/access/heap/tuptoaster.c | 38 +++++++++++++++++++++++++++-- src/backend/access/transam/xlogreader.c | 2 +- src/backend/utils/adt/varlena.c | 22 ++++++++++------- src/common/pg_lzcompress.c | 42 +++++++++++++++------------------ src/include/common/pg_lzcompress.h | 2 +- 5 files changed, 70 insertions(+), 36 deletions(-)
