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Postgres FD Implementation
Commit 47933140 authored by Tom Lane's avatar Tom Lane
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Doc: consistently identify OID catalog columns that can be zero. 

Not all OID-reference columns that can contain zeroes (indicating
"no reference") were explicitly marked in catalogs.sgml.  Fix that,
and try to make the style a little more consistent while at it ---
for example, consistently write "zero" not "0" for these cases.

Joel Jacobson and Tom Lane

Discussion: https://postgr.es/m/4ed9a372-7bf9-479a-926c-ae8e774717a8@www.fastmail.com
parent dfcc46fe
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doc/src/sgml/catalogs.sgml
View file @ 47933140
......@@ -1150,7 +1150,7 @@
(references <link linkend="catalog-pg-type"><structname>pg_type</structname></link>.<structfield>oid</structfield>)
</para>
<para>
The data type of this column
The data type of this column (zero for a dropped column)
</para></entry>
</row>
......@@ -1351,7 +1351,7 @@
</para>
<para>
The defined collation of the column, or zero if the column is
not of a collatable data type.
not of a collatable data type
</para></entry>
</row>
......@@ -1899,8 +1899,8 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</para>
<para>
The OID of the data type that corresponds to this table's row type,
if any (zero for indexes, sequences, and toast tables, which have
no <structname>pg_type</structname> entry)
if any; zero for indexes, sequences, and toast tables, which have
no <structname>pg_type</structname> entry
</para></entry>
</row>
......@@ -1910,7 +1910,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-type"><structname>pg_type</structname></link>.<structfield>oid</structfield>)
</para>
<para>
For typed tables, the OID of the underlying composite type,
For typed tables, the OID of the underlying composite type;
zero for all other relations
</para></entry>
</row>
......@@ -1932,7 +1932,8 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</para>
<para>
If this is a table or an index, the access method used (heap,
B-tree, hash, etc.)
B-tree, hash, etc.); otherwise zero (zero occurs for sequences,
as well as relations without storage, such as views)
</para></entry>
</row>
......@@ -2007,7 +2008,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>oid</structfield>)
</para>
<para>
OID of the TOAST table associated with this table, 0 if none. The
OID of the TOAST table associated with this table, zero if none. The
TOAST table stores large attributes <quote>out of line</quote> in a
secondary table.
</para></entry>
......@@ -2174,8 +2175,8 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
<para>
For new relations being written during a DDL operation that requires a
table rewrite, this contains the OID of the original relation;
otherwise 0. That state is only visible internally; this field should
never contain anything other than 0 for a user-visible relation.
otherwise zero. That state is only visible internally; this field should
never contain anything other than zero for a user-visible relation.
</para></entry>
</row>
......@@ -2507,7 +2508,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>oid</structfield>)
</para>
<para>
The table this constraint is on; 0 if not a table constraint
The table this constraint is on; zero if not a table constraint
</para></entry>
</row>
......@@ -2517,7 +2518,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-type"><structname>pg_type</structname></link>.<structfield>oid</structfield>)
</para>
<para>
The domain this constraint is on; 0 if not a domain constraint
The domain this constraint is on; zero if not a domain constraint
</para></entry>
</row>
......@@ -2528,7 +2529,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</para>
<para>
The index supporting this constraint, if it's a unique, primary
key, foreign key, or exclusion constraint; else 0
key, foreign key, or exclusion constraint; else zero
</para></entry>
</row>
......@@ -2538,8 +2539,8 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-constraint"><structname>pg_constraint</structname></link>.<structfield>oid</structfield>)
</para>
<para>
The corresponding constraint in the parent partitioned table,
if this is a constraint in a partition; else 0
The corresponding constraint of the parent partitioned table,
if this is a constraint on a partition; else zero
</para></entry>
</row>
......@@ -2549,7 +2550,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>oid</structfield>)
</para>
<para>
If a foreign key, the referenced table; else 0
If a foreign key, the referenced table; else zero
</para></entry>
</row>
......@@ -3142,7 +3143,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</para>
<para>
The OID of the namespace associated with this entry,
or 0 if none
or zero if none
</para></entry>
</row>
......@@ -3176,7 +3177,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
A <structname>pg_default_acl</structname> entry shows the initial privileges to
be assigned to an object belonging to the indicated user. There are
currently two types of entry: <quote>global</quote> entries with
<structfield>defaclnamespace</structfield> = 0, and <quote>per-schema</quote> entries
<structfield>defaclnamespace</structfield> = zero, and <quote>per-schema</quote> entries
that reference a particular schema. If a global entry is present then
it <emphasis>overrides</emphasis> the normal hard-wired default privileges
for the object type. A per-schema entry, if present, represents privileges
......@@ -3236,7 +3237,8 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>oid</structfield>)
</para>
<para>
The OID of the system catalog the dependent object is in
The OID of the system catalog the dependent object is in,
or zero for a <symbol>DEPENDENCY_PIN</symbol> entry
</para></entry>
</row>
......@@ -3246,7 +3248,8 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references any OID column)
</para>
<para>
The OID of the specific dependent object
The OID of the specific dependent object,
or zero for a <symbol>DEPENDENCY_PIN</symbol> entry
</para></entry>
</row>
......@@ -4687,7 +4690,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
For noninternal languages this references the language
handler, which is a special function that is responsible for
executing all functions that are written in the particular
language
language. Zero for internal languages.
</para></entry>
</row>
......@@ -5189,7 +5192,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-type"><structname>pg_type</structname></link>.<structfield>oid</structfield>)
</para>
<para>
Type of the left operand (0 if none)
Type of the left operand (zero for a prefix operator)
</para></entry>
</row>
......@@ -5210,6 +5213,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</para>
<para>
Type of the result
(zero for a not-yet-defined <quote>shell</quote> operator)
</para></entry>
</row>
......@@ -5219,7 +5223,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-operator"><structname>pg_operator</structname></link>.<structfield>oid</structfield>)
</para>
<para>
Commutator of this operator, if any
Commutator of this operator (zero if none)
</para></entry>
</row>
......@@ -5229,7 +5233,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-operator"><structname>pg_operator</structname></link>.<structfield>oid</structfield>)
</para>
<para>
Negator of this operator, if any
Negator of this operator (zero if none)
</para></entry>
</row>
......@@ -5240,6 +5244,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</para>
<para>
Function that implements this operator
(zero for a not-yet-defined <quote>shell</quote> operator)
</para></entry>
</row>
......@@ -5250,6 +5255,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</para>
<para>
Restriction selectivity estimation function for this operator
(zero if none)
</para></entry>
</row>
......@@ -5260,17 +5266,13 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</para>
<para>
Join selectivity estimation function for this operator
(zero if none)
</para></entry>
</row>
</tbody>
</tgroup>
</table>
<para>
Unused columns contain zeroes. For example, <structfield>oprleft</structfield>
is zero for a prefix operator.
</para>
</sect1>
......@@ -5426,7 +5428,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
<structfield>partnatts</structfield> <type>int2</type>
</para>
<para>
The number of columns in partition key
The number of columns in the partition key
</para></entry>
</row>
......@@ -5438,7 +5440,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
<para>
The OID of the <link linkend="catalog-pg-class"><structname>pg_class</structname></link> entry for the default partition
of this partitioned table, or zero if this partitioned table does not
have a default partition.
have a default partition
</para></entry>
</row>
......@@ -5588,7 +5590,9 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-authid"><structname>pg_authid</structname></link>.<structfield>oid</structfield>)
</para>
<para>
The roles to which the policy is applied
The roles to which the policy is applied;
zero means <literal>PUBLIC</literal>
(and normally appears alone in the array)
</para></entry>
</row>
......@@ -5744,8 +5748,8 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.<structfield>oid</structfield>)
</para>
<para>
Optional planner support function for this function
(see <xref linkend="xfunc-optimization"/>)
Planner support function for this function
(see <xref linkend="xfunc-optimization"/>), or zero if none
</para></entry>
</row>
......@@ -6256,7 +6260,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-collation"><structname>pg_collation</structname></link>.<structfield>oid</structfield>)
</para>
<para>
OID of the collation used for range comparisons, or 0 if none
OID of the collation used for range comparisons, or zero if none
</para></entry>
</row>
......@@ -6277,7 +6281,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</para>
<para>
OID of the function to convert a range value into canonical form,
or 0 if none
or zero if none
</para></entry>
</row>
......@@ -6288,7 +6292,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</para>
<para>
OID of the function to return the difference between two element
values as <type>double precision</type>, or 0 if none
values as <type>double precision</type>, or zero if none
</para></entry>
</row>
</tbody>
......@@ -6733,6 +6737,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
<para>
The OID of the database the dependent object is in,
or zero for a shared object
or a <symbol>SHARED_DEPENDENCY_PIN</symbol> entry
</para></entry>
</row>
......@@ -6742,7 +6747,8 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-class"><structname>pg_class</structname></link>.<structfield>oid</structfield>)
</para>
<para>
The OID of the system catalog the dependent object is in
The OID of the system catalog the dependent object is in,
or zero for a <symbol>SHARED_DEPENDENCY_PIN</symbol> entry
</para></entry>
</row>
......@@ -6752,7 +6758,8 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references any OID column)
</para>
<para>
The OID of the specific dependent object
The OID of the specific dependent object,
or zero for a <symbol>SHARED_DEPENDENCY_PIN</symbol> entry
</para></entry>
</row>
......@@ -7192,6 +7199,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
<replaceable>N</replaceable>th <quote>slot</quote>. For example, a
histogram slot would show the <literal>&lt;</literal> operator
that defines the sort order of the data.
Zero if the statistics kind does not require an operator.
</para></entry>
</row>
......@@ -7836,7 +7844,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
<para>
The OID of the function to use when converting the data type for input
to the procedural language (e.g., function parameters). Zero is stored
if this operation is not supported.
if the default behavior should be used.
</para></entry>
</row>
......@@ -7848,7 +7856,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
<para>
The OID of the function to use when converting output from the
procedural language (e.g., return values) to the data type. Zero is
stored if this operation is not supported.
stored if the default behavior should be used.
</para></entry>
</row>
</tbody>
......@@ -7911,9 +7919,9 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-trigger"><structname>pg_trigger</structname></link>.<structfield>oid</structfield>)
</para>
<para>
Parent trigger that this trigger is cloned from, zero if not a clone;
this happens when partitions are created or attached to a partitioned
table.
Parent trigger that this trigger is cloned from (this happens when
partitions are created or attached to a partitioned table);
zero if not a clone
</para></entry>
</row>
......@@ -7976,6 +7984,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
</para>
<para>
The table referenced by a referential integrity constraint
(zero if trigger is not for a referential integrity constraint)
</para></entry>
</row>
......@@ -7987,6 +7996,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
<para>
The index supporting a unique, primary key, referential integrity,
or exclusion constraint
(zero if trigger is not for one of these types of constraint)
</para></entry>
</row>
......@@ -7996,7 +8006,8 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-constraint"><structname>pg_constraint</structname></link>.<structfield>oid</structfield>)
</para>
<para>
The <link linkend="catalog-pg-constraint"><structname>pg_constraint</structname></link> entry associated with the trigger, if any
The <link linkend="catalog-pg-constraint"><structname>pg_constraint</structname></link> entry associated with the trigger
(zero if trigger is not for a constraint)
</para></entry>
</row>
......@@ -8478,7 +8489,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.<structfield>oid</structfield>)
</para>
<para>
OID of the parser's headline function
OID of the parser's headline function (zero if none)
</para></entry>
</row>
......@@ -8566,7 +8577,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.<structfield>oid</structfield>)
</para>
<para>
OID of the template's initialization function
OID of the template's initialization function (zero if none)
</para></entry>
</row>
......@@ -8786,11 +8797,11 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-type"><structname>pg_type</structname></link>.<structfield>oid</structfield>)
</para>
<para>
If <structfield>typelem</structfield> is not 0 then it
If <structfield>typelem</structfield> is not zero then it
identifies another row in <structname>pg_type</structname>,
defining the type yielded by subscripting. This should be 0
if <structfield>typsubscript</structfield> is 0. However, it can
be 0 when <structfield>typsubscript</structfield> isn't 0, if the
defining the type yielded by subscripting. This should be zero
if <structfield>typsubscript</structfield> is zero. However, it can
be zero when <structfield>typsubscript</structfield> isn't zero, if the
handler doesn't need <structfield>typelem</structfield> to
determine the subscripting result type.
Note that a <structfield>typelem</structfield> dependency is
......@@ -8806,7 +8817,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-type"><structname>pg_type</structname></link>.<structfield>oid</structfield>)
</para>
<para>
If <structfield>typarray</structfield> is not 0 then it
If <structfield>typarray</structfield> is not zero then it
identifies another row in <structname>pg_type</structname>, which
is the <quote>true</quote> array type having this type as element
</para></entry>
......@@ -8838,7 +8849,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.<structfield>oid</structfield>)
</para>
<para>
Input conversion function (binary format), or 0 if none
Input conversion function (binary format), or zero if none
</para></entry>
</row>
......@@ -8848,7 +8859,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.<structfield>oid</structfield>)
</para>
<para>
Output conversion function (binary format), or 0 if none
Output conversion function (binary format), or zero if none
</para></entry>
</row>
......@@ -8858,7 +8869,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.<structfield>oid</structfield>)
</para>
<para>
Type modifier input function, or 0 if type does not support modifiers
Type modifier input function, or zero if type does not support modifiers
</para></entry>
</row>
......@@ -8868,7 +8879,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.<structfield>oid</structfield>)
</para>
<para>
Type modifier output function, or 0 to use the standard format
Type modifier output function, or zero to use the standard format
</para></entry>
</row>
......@@ -8878,7 +8889,8 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-proc"><structname>pg_proc</structname></link>.<structfield>oid</structfield>)
</para>
<para>
Custom <xref linkend="sql-analyze"/> function, or 0 to use the standard function
Custom <xref linkend="sql-analyze"/> function,
or zero to use the standard function
</para></entry>
</row>
......@@ -9198,7 +9210,7 @@ SCRAM-SHA-256$<replaceable>&lt;iteration count&gt;</replaceable>:<replaceable>&l
(references <link linkend="catalog-pg-authid"><structname>pg_authid</structname></link>.<structfield>oid</structfield>)
</para>
<para>
OID of the local role being mapped, 0 if the user mapping is public
OID of the local role being mapped, or zero if the user mapping is public
</para></entry>
</row>
......@@ -13403,7 +13415,7 @@ SELECT * FROM pg_locks pl LEFT JOIN pg_prepared_xacts ppx
(references <link linkend="catalog-pg-authid"><structname>pg_authid</structname></link>.<structfield>oid</structfield>)
</para>
<para>
OID of the local role being mapped, 0 if the user mapping is public
OID of the local role being mapped, or zero if the user mapping is public
</para></entry>
</row>
......
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