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Add bytea equivalents of ltrim() and rtrim().

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We had bytea btrim() already, but for some reason not the other two.

Joel Jacobson

Discussion: https://postgr.es/m/d10cd5cd-a901-42f1-b832-763ac6f7ff3a@www.fastmail.com
This commit is contained in:
Tom Lane
2021-01-18 15:11:32 -05:00
parent a3ed4d1efe
commit a6cf3df4eb
9 changed files with 203 additions and 57 deletions
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49
doc/src/sgml/func.sgml
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@@ -3948,15 +3948,16 @@ SELECT format('Testing %3$s, %2$s, %s', 'one', 'two', 'three');
<indexterm>
<primary>trim</primary>
</indexterm>
<function>trim</function> ( <optional> <literal>BOTH</literal> </optional>
<function>trim</function> ( <optional> <literal>LEADING</literal> | <literal>TRAILING</literal> | <literal>BOTH</literal> </optional>
<parameter>bytesremoved</parameter> <type>bytea</type> <literal>FROM</literal>
<parameter>bytes</parameter> <type>bytea</type> )
<returnvalue>bytea</returnvalue>
</para>
<para>
Removes the longest string containing only bytes appearing in
<parameter>bytesremoved</parameter> from the start
and end of <parameter>bytes</parameter>.
<parameter>bytesremoved</parameter> from the start,
end, or both ends (<literal>BOTH</literal> is the default)
of <parameter>bytes</parameter>.
</para>
<para>
<literal>trim('\x9012'::bytea from '\x1234567890'::bytea)</literal>
@@ -3966,7 +3967,7 @@ SELECT format('Testing %3$s, %2$s, %s', 'one', 'two', 'three');
<row>
<entry role="func_table_entry"><para role="func_signature">
<function>trim</function> ( <optional> <literal>BOTH</literal> </optional> <optional> <literal>FROM</literal> </optional>
<function>trim</function> ( <optional> <literal>LEADING</literal> | <literal>TRAILING</literal> | <literal>BOTH</literal> </optional> <optional> <literal>FROM</literal> </optional>
<parameter>bytes</parameter> <type>bytea</type>,
<parameter>bytesremoved</parameter> <type>bytea</type> )
<returnvalue>bytea</returnvalue>
@@ -4109,6 +4110,26 @@ SELECT format('Testing %3$s, %2$s, %s', 'one', 'two', 'three');
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>ltrim</primary>
</indexterm>
<function>ltrim</function> ( <parameter>bytes</parameter> <type>bytea</type>,
<parameter>bytesremoved</parameter> <type>bytea</type> )
<returnvalue>bytea</returnvalue>
</para>
<para>
Removes the longest string containing only bytes appearing in
<parameter>bytesremoved</parameter> from the start of
<parameter>bytes</parameter>.
</para>
<para>
<literal>ltrim('\x1234567890'::bytea, '\x9012'::bytea)</literal>
<returnvalue>\x34567890</returnvalue>
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
@@ -4127,6 +4148,26 @@ SELECT format('Testing %3$s, %2$s, %s', 'one', 'two', 'three');
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>
<primary>rtrim</primary>
</indexterm>
<function>rtrim</function> ( <parameter>bytes</parameter> <type>bytea</type>,
<parameter>bytesremoved</parameter> <type>bytea</type> )
<returnvalue>bytea</returnvalue>
</para>
<para>
Removes the longest string containing only bytes appearing in
<parameter>bytesremoved</parameter> from the end of
<parameter>bytes</parameter>.
</para>
<para>
<literal>rtrim('\x1234567890'::bytea, '\x9012'::bytea)</literal>
<returnvalue>\x12345678</returnvalue>
</para></entry>
</row>
<row>
<entry role="func_table_entry"><para role="func_signature">
<indexterm>