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-rw-r--r--src/include/catalog/pg_opclass.dat7
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' },