(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>
</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>
</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>
(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>
</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>
(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>
<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>
(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>
(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>
</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>
(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>
(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>
</para>
<para>
The OID of the namespace associated with this entry,
- or 0 if none
+ or zero if none
</para></entry>
</row>
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
(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>
(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>
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>
(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>
</para>
<para>
Type of the result
+ (zero for a not-yet-defined <quote>shell</quote> operator)
</para></entry>
</row>
(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>
(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>
</para>
<para>
Function that implements this operator
+ (zero for a not-yet-defined <quote>shell</quote> operator)
</para></entry>
</row>
</para>
<para>
Restriction selectivity estimation function for this operator
+ (zero if none)
</para></entry>
</row>
</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>
<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>
<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>
(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>
(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>
(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>
</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>
</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>
<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>
(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>
(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>
<replaceable>N</replaceable>th <quote>slot</quote>. For example, a
histogram slot would show the <literal><</literal> operator
that defines the sort order of the data.
+ Zero if the statistics kind does not require an operator.
</para></entry>
</row>
<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>
<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>
(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>
</para>
<para>
The table referenced by a referential integrity constraint
+ (zero if trigger is not for a referential integrity constraint)
</para></entry>
</row>
<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>
(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>
(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>
(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>
(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
(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>
(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>
(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>
(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>
(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>
(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>
(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>
(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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