postgresql

Commit Graph

Author	SHA1	Message	Date
Peter Eisentraut	afa0d53d4d	Improve whitespace The SQL file was using a mix of tabs and spaces inconsistently. Convert all to spaces and adjust indentation accordingly.	2020-10-19 08:32:53 +02:00
Robert Haas	81c5e46c49	Introduce 64-bit hash functions with a 64-bit seed. This will be useful for hash partitioning, which needs a way to seed the hash functions to avoid problems such as a hash index on a hash partitioned table clumping all values into a small portion of the bucket space; it's also useful for anything that wants a 64-bit hash value rather than a 32-bit hash value. Just in case somebody wants a 64-bit hash value that is compatible with the existing 32-bit hash values, make the low 32-bits of the 64-bit hash value match the 32-bit hash value when the seed is 0. Robert Haas and Amul Sul Discussion: http://postgr.es/m/CA+Tgmoafx2yoJuhCQQOL5CocEi-w_uG4S2xT0EtgiJnPGcHW3g@mail.gmail.com	2017-08-31 22:21:21 -04:00

Author

SHA1

Message

Date

Peter Eisentraut

afa0d53d4d

Improve whitespace

The SQL file was using a mix of tabs and spaces inconsistently.
Convert all to spaces and adjust indentation accordingly.

2020-10-19 08:32:53 +02:00

Robert Haas

81c5e46c49

Introduce 64-bit hash functions with a 64-bit seed.

This will be useful for hash partitioning, which needs a way to seed
the hash functions to avoid problems such as a hash index on a hash
partitioned table clumping all values into a small portion of the
bucket space; it's also useful for anything that wants a 64-bit hash
value rather than a 32-bit hash value.

Just in case somebody wants a 64-bit hash value that is compatible
with the existing 32-bit hash values, make the low 32-bits of the
64-bit hash value match the 32-bit hash value when the seed is 0.

Robert Haas and Amul Sul

Discussion: http://postgr.es/m/CA+Tgmoafx2yoJuhCQQOL5CocEi-w_uG4S2xT0EtgiJnPGcHW3g@mail.gmail.com

2017-08-31 22:21:21 -04:00

2 Commits