diff options
Diffstat (limited to 'src/include/catalog/pg_opclass.dat')
| -rw-r--r-- | src/include/catalog/pg_opclass.dat | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/src/include/catalog/pg_opclass.dat b/src/include/catalog/pg_opclass.dat index dbcae7f..7a939d9 100644 --- a/src/include/catalog/pg_opclass.dat +++ b/src/include/catalog/pg_opclass.dat @@ -91,8 +91,11 @@ # Here's an ugly little hack to save space in the system catalog indexes. # btree doesn't ordinarily allow a storage type different from input type; # but cstring and name are the same thing except for trailing padding, -# and we can safely omit that within an index entry. So we declare the -# btree opclass for name as using cstring storage type. +# so we choose to omit that within an index entry. Here we declare the +# btree opclass for name as using cstring storage type. This does require +# that we pad the cstring out with the full NAMEDATALEN bytes when performing +# index-only scans. See corresponding hacks in ExecInitIndexOnlyScan() and +# StoreIndexTuple(). { opcmethod => 'btree', opcname => 'name_ops', opcfamily => 'btree/text_ops', opcintype => 'name', opckeytype => 'cstring' }, |