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Correct comment and some documentation about REPLICA_IDENTITY_INDEX

catalog/pg_class.h was stating that REPLICA_IDENTITY_INDEX with adropped index is equivalent to REPLICA_IDENTITY_DEFAULT. The code tellsa different story, as it is equivalent to REPLICA_IDENTITY_NOTHING.The behavior exists since the introduction of replica identities, andfe7fd4e even added tests for this case but I somewhat forgot to fix thiscomment.While on it, this commit reorganizes the documentation about replicaidentities on the ALTER TABLE page, and a note is added about the caseof dropped indexes with REPLICA_IDENTITY_INDEX.Author: Michael Paquier, Wei WangReviewed-by: Euler TaveiraDiscussion:https://postgr.es/m/OS3PR01MB6275464AD0A681A0793F56879E759@OS3PR01MB6275.jpnprd01.prod.outlook.comBackpatch-through: 10

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doc/src/sgml/ref
- alter_table.sgml
src/include/catalog
- pg_class.h

2 files changed

+44

-9

lines changed

`‎doc/src/sgml/ref/alter_table.sgml‎`

Lines changed: 43 additions & 8 deletions

Original file line number	Diff line number	Diff line change
`@@ -872,16 +872,51 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM`
`872`	`872`	`<para>`
`873`	`873`	`This form changes the information which is written to the write-ahead log`
`874`	`874`	`to identify rows which are updated or deleted. This option has no effect`
`875`		`- except when logical replication is in use. <literal>DEFAULT</literal>`
`876`		`- (the default for non-system tables) records the`
`877`		`- old values of the columns of the primary key, if any. <literal>USING INDEX</literal>`
`878`		`- records the old values of the columns covered by the named index, which`
`879`		`- must be unique, not partial, not deferrable, and include only columns marked`
`880`		`- <literal>NOT NULL</literal>. <literal>FULL</literal> records the old values of all columns`
`881`		`- in the row. <literal>NOTHING</literal> records no information about the old row.`
`882`		`- (This is the default for system tables.)`
	`875`	`+ except when logical replication is in use.`
`883`	`876`	`In all cases, no old values are logged unless at least one of the columns`
`884`	`877`	`that would be logged differs between the old and new versions of the row.`
	`878`	`+ <variablelist>`
	`879`	`+ <varlistentry>`
	`880`	`+ <term><literal>DEFAULT</literal></term>`
	`881`	`+ <listitem>`
	`882`	`+ <para>`
	`883`	`+ Records the old values of the columns of the primary key, if any.`
	`884`	`+ This is the default for non-system tables.`
	`885`	`+ </para>`
	`886`	`+ </listitem>`
	`887`	`+ </varlistentry>`
	`888`	`+`
	`889`	`+ <varlistentry>`
	`890`	`+ <term><literal>USING INDEX <replaceable class="parameter">index_name</replaceable></literal></term>`
	`891`	`+ <listitem>`
	`892`	`+ <para>`
	`893`	`+ Records the old values of the columns covered by the named index,`
	`894`	`+ that must be unique, not partial, not deferrable, and include only`
	`895`	`+ columns marked <literal>NOT NULL</literal>. If this index is`
	`896`	`+ dropped, the behavior is the same as <literal>NOTHING</literal>.`
	`897`	`+ </para>`
	`898`	`+ </listitem>`
	`899`	`+ </varlistentry>`
	`900`	`+`
	`901`	`+ <varlistentry>`
	`902`	`+ <term><literal>FULL</literal></term>`
	`903`	`+ <listitem>`
	`904`	`+ <para>`
	`905`	`+ Records the old values of all columns in the row.`
	`906`	`+ </para>`
	`907`	`+ </listitem>`
	`908`	`+ </varlistentry>`
	`909`	`+`
	`910`	`+ <varlistentry>`
	`911`	`+ <term><literal>NOTHING</literal></term>`
	`912`	`+ <listitem>`
	`913`	`+ <para>`
	`914`	`+ Records no information about the old row. This is the default for`
	`915`	`+ system tables.`
	`916`	`+ </para>`
	`917`	`+ </listitem>`
	`918`	`+ </varlistentry>`
	`919`	`+ </variablelist>`
`885`	`920`	`</para>`
`886`	`921`	`</listitem>`
`887`	`922`	`</varlistentry>`

`‎src/include/catalog/pg_class.h‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -182,7 +182,7 @@ DECLARE_INDEX(pg_class_tblspc_relfilenode_index, 3455, ClassTblspcRelfilenodeInd`
`182`	`182`	`/*`
`183`	`183`	`* an explicitly chosen candidate key's columns are used as replica identity.`
`184`	`184`	`* Note this will still be set if the index has been dropped; in that case it`
`185`		`- * has the same meaning as 'd'.`
	`185`	`+ * has the same meaning as 'n'.`
`186`	`186`	`*/`
`187`	`187`	`#defineREPLICA_IDENTITY_INDEX'i'`
`188`	`188`

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`‎doc/src/sgml/ref/alter_table.sgml‎`

`‎src/include/catalog/pg_class.h‎`

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