diff options
| author | Peter Eisentraut | 2024-01-13 17:14:53 +0000 |
|---|---|---|
| committer | Peter Eisentraut | 2024-01-13 17:14:53 +0000 |
| commit | 4f622503d6de975ac87448aea5cea7de4bc140d5 (patch) | |
| tree | c09756e667e5150678e8ebf9aee6c1cd5e376a96 /src/include/commands | |
| parent | 45da69371ebfc4d6982695e58791989660c1cc33 (diff) | |
Make attstattarget nullable
This changes the pg_attribute field attstattarget into a nullable
field in the variable-length part of the row. If no value is set by
the user for attstattarget, it is now null instead of previously -1.
This saves space in pg_attribute and tuple descriptors for most
practical scenarios. (ATTRIBUTE_FIXED_PART_SIZE is reduced from 108
to 104.) Also, null is the semantically more correct value.
The ANALYZE code internally continues to represent the default
statistics target by -1, so that that code can avoid having to deal
with null values. But that is now contained to the ANALYZE code.
Only the DDL code deals with attstattarget possibly null.
For system columns, the field is now always null. The ANALYZE code
skips system columns anyway.
To set a column's statistics target to the default value, the new
command form ALTER TABLE ... SET STATISTICS DEFAULT can be used. (SET
STATISTICS -1 still works.)
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://www.postgresql.org/message-id/flat/4da8d211-d54d-44b9-9847-f2a9f1184c76@eisentraut.org
Diffstat (limited to 'src/include/commands')
| -rw-r--r-- | src/include/commands/vacuum.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/include/commands/vacuum.h b/src/include/commands/vacuum.h index 5cacefc7670..7f623b37fdc 100644 --- a/src/include/commands/vacuum.h +++ b/src/include/commands/vacuum.h @@ -121,7 +121,7 @@ typedef struct VacAttrStats * than the underlying column/expression. Therefore, use these fields for * information about the datatype being fed to the typanalyze function. */ - int attstattarget; + int attstattarget; /* -1 to use default */ Oid attrtypid; /* type of data being analyzed */ int32 attrtypmod; /* typmod of data being analyzed */ Form_pg_type attrtype; /* copy of pg_type row for attrtypid */ |