Re: Operator class parameters and sgml docs

On Sat, Jun 20, 2020 at 01:55:33PM +0300, Alexander Korotkov wrote:
> On Thu, Jun 18, 2020 at 8:06 PM Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru> wrote:
> > On Wed, Jun 17, 2020 at 2:00 PM Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru> wrote:
> > > On Wed, Jun 17, 2020 at 2:50 AM Peter Geoghegan <pg(at)bowt(dot)ie> wrote:
> > > > On Tue, Jun 16, 2020 at 4:24 AM Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru> wrote:
> > > > > Thank you for patience. The documentation patch is attached. I think
> > > > > it requires review by native english speaker.
...
> > > Fixed, thanks!
> > >
> > > > It's very hard to write documentation like this, even for native
> > > > English speakers. I think that it's important to have something in
> > > > place, though. The GiST example helps a lot.
...
> > I'm going to push this patch if there are no objections. I'm almost
> > sure that documentation of opclass options will require further
> > adjustments. However, I think the current patch makes it better, not
> > worse.
>
> So, pushed!

Find attached some language review of user-facing docs.

diff --git a/doc/src/sgml/brin.sgml b/doc/src/sgml/brin.sgml
index d7f1af7819..4c5eeb875f 100644
--- a/doc/src/sgml/brin.sgml
+++ b/doc/src/sgml/brin.sgml
@@ -562,7 +562,7 @@ typedef struct BrinOpcInfo
</varlistentry>
</variablelist>

[-Optionally, an-]{+An+} operator class for <acronym>BRIN</acronym> can [-supply-]{+optionally specify+} the
following method:

<variablelist>
@@ -570,22 +570,22 @@ typedef struct BrinOpcInfo
<term><function>void options(local_relopts *relopts)</function></term>
<listitem>
<para>
Defines {+a+} set of user-visible parameters that control operator class
behavior.
</para>

<para>
The <function>options</function> function [-has given-]{+is passed a+} pointer to {+a+}
<replaceable>local_relopts</replaceable> struct, which needs to be
filled with a set of operator class specific options. The options
can be accessed from other support functions using {+the+}
<literal>PG_HAS_OPCLASS_OPTIONS()</literal> and
<literal>PG_GET_OPCLASS_OPTIONS()</literal> macros.
</para>

<para>
Since both key extraction [-for-]{+of+} indexed [-value-]{+values+} and representation of the
key in <acronym>GIN</acronym> are flexible, [-it-]{+they+} may [-depends-]{+depend+} on
user-specified parameters.
</para>
</listitem>
diff --git a/doc/src/sgml/btree.sgml b/doc/src/sgml/btree.sgml
index 2c4dd48ea3..b17b166e84 100644
--- a/doc/src/sgml/btree.sgml
+++ b/doc/src/sgml/btree.sgml
@@ -557,7 +557,7 @@ equalimage(<replaceable>opcintype</replaceable> <type>oid</type>) returns bool
Optionally, a B-tree operator family may provide
<function>options</function> (<quote>operator class specific
options</quote>) support functions, registered under support
function number 5. These functions define {+a+} set of user-visible
parameters that control operator class behavior.
</para>
<para>
@@ -566,19 +566,19 @@ equalimage(<replaceable>opcintype</replaceable> <type>oid</type>) returns bool
<synopsis>
options(<replaceable>relopts</replaceable> <type>local_relopts *</type>) returns void
</synopsis>
The function [-has given-]{+is passed a+} pointer to {+a+} <replaceable>local_relopts</replaceable>
struct, which needs to be filled with a set of operator class
specific options. The options can be accessed from other support
functions using {+the+} <literal>PG_HAS_OPCLASS_OPTIONS()</literal> and
<literal>PG_GET_OPCLASS_OPTIONS()</literal> macros.
</para>
<para>
Currently, no B-Tree operator class has {+an+} <function>options</function>
support function. B-tree doesn't allow flexible representation of keys
like GiST, SP-GiST, GIN and BRIN do. So, <function>options</function>
probably doesn't have much [-usage-]{+application+} in {+the+} current[-shape of-] B-tree index
access method. Nevertheless, this support function was added to B-tree
for uniformity, and[-probably it-] will [-found its usage-]{+probably find uses+} during further
evolution of B-tree in <productname>PostgreSQL</productname>.
</para>
</listitem>
diff --git a/doc/src/sgml/gin.sgml b/doc/src/sgml/gin.sgml
index d85e7c8796..7a8c18a449 100644
--- a/doc/src/sgml/gin.sgml
+++ b/doc/src/sgml/gin.sgml
@@ -411,17 +411,17 @@
</para>

<para>
The <function>options</function> function [-has given-]{+is passed a+} pointer to {+a+}
<replaceable>local_relopts</replaceable> struct, which needs to be
filled with [-s-]{+a+} set of operator class specific options. The options
can be accessed from other support functions using {+the+}
<literal>PG_HAS_OPCLASS_OPTIONS()</literal> and
<literal>PG_GET_OPCLASS_OPTIONS()</literal> macros.
</para>

<para>
Since both key extraction [-for-]{+of+} indexed [-value-]{+values+} and representation of the
key in <acronym>GIN</acronym> are flexible, [-it-]{+they+} may [-depends-]{+depend+} on
user-specified parameters.
</para>
</listitem>
diff --git a/doc/src/sgml/gist.sgml b/doc/src/sgml/gist.sgml
index 31c28fdb61..5d970ee9f2 100644
--- a/doc/src/sgml/gist.sgml
+++ b/doc/src/sgml/gist.sgml
@@ -946,7 +946,7 @@ my_fetch(PG_FUNCTION_ARGS)
<term><function>options</function></term>
<listitem>
<para>
Allows [-defintion-]{+definition+} of user-visible parameters that control operator
class behavior.
</para>

@@ -962,16 +962,16 @@ LANGUAGE C STRICT;
</para>

<para>
The function [-has given-]{+is passed a+} pointer to {+a+} <replaceable>local_relopts</replaceable>
struct, which needs to be filled with a set of operator class
specific options. The options can be accessed from other support
functions using {+the+} <literal>PG_HAS_OPCLASS_OPTIONS()</literal> and
<literal>PG_GET_OPCLASS_OPTIONS()</literal> macros.
</para>

<para>
[-The sample-]{+An example+} implementation of [-my_option()-]{+my_options()+} and parameters [-usage-]
[- in the another-]{+use+}
{+ from other+} support [-function-]{+functions+} are given below:

<programlisting>
typedef enum MyEnumType
@@ -990,7 +990,7 @@ typedef struct
int str_param; /* string parameter */
} MyOptionsStruct;

/* String [-representations for-]{+representation of+} enum values */
static relopt_enum_elt_def myEnumValues[] =
{
{"on", MY_ENUM_ON},
@@ -1002,7 +1002,7 @@ static relopt_enum_elt_def myEnumValues[] =
static char *str_param_default = "default";

/*
* Sample [-validatior:-]{+validator:+} checks that string is not longer than 8 bytes.
*/
static void
validate_my_string_relopt(const char *value)
@@ -1090,8 +1090,8 @@ my_compress(PG_FUNCTION_ARGS)

<para>
Since the representation of the key in <acronym>GiST</acronym> is
flexible, it may [-depends-]{+depend+} on user-specified parameters. For [-instace,-]{+instance,+}
the length of key signature may be [-such parameter.-]{+specified.+} See
<literal>gtsvector_options()</literal> for example.
</para>
</listitem>
diff --git a/doc/src/sgml/spgist.sgml b/doc/src/sgml/spgist.sgml
index 03f914735b..1395dbaf88 100644
--- a/doc/src/sgml/spgist.sgml
+++ b/doc/src/sgml/spgist.sgml
@@ -895,16 +895,16 @@ LANGUAGE C STRICT;
</para>

<para>
The function [-has given-]{+is passed a+} pointer to {+a+} <replaceable>local_relopts</replaceable>
struct, which needs to be filled with a set of operator class
specific options. The options can be accessed from other support
functions using {+the+} <literal>PG_HAS_OPCLASS_OPTIONS()</literal> and
<literal>PG_GET_OPCLASS_OPTIONS()</literal> macros.
</para>

<para>
Since the representation of the key in <acronym>SP-GiST</acronym> is
flexible, it may [-depends-]{+depend+} on user-specified parameters.
</para>
</listitem>
</varlistentry>
diff --git a/doc/src/sgml/xindex.sgml b/doc/src/sgml/xindex.sgml
index 0e4587a81b..2cfd71b5b7 100644
--- a/doc/src/sgml/xindex.sgml
+++ b/doc/src/sgml/xindex.sgml
@@ -410,9 +410,9 @@
</para>

<para>
Additionally, some opclasses allow [-user-]{+users+} to [-set specific parameters,-]{+specify parameters+} which
[-controls its-]{+control their+} behavior. Each builtin index access method [-have-]{+has an+} optional
<function>options</function> support function, which defines {+a+} set of
opclass-specific parameters.
</para>

@@ -459,7 +459,7 @@
</row>
<row>
<entry>
Defines {+a+} set of options that are specific [-for-]{+to+} this operator class
(optional)
</entry>
<entry>5</entry>
@@ -501,7 +501,7 @@
</row>
<row>
<entry>
Defines {+a+} set of options that are specific [-for-]{+to+} this operator class
(optional)
</entry>
<entry>3</entry>
@@ -584,7 +584,7 @@
<row>
<entry><function>options</function></entry>
<entry>
Defines {+a+} set of options that are specific [-for-]{+to+} this operator class
(optional)
</entry>
<entry>10</entry>
@@ -643,7 +643,7 @@
<row>
<entry><function>options</function></entry>
<entry>
Defines {+a+} set of options that are specific [-for-]{+to+} this operator class
(optional)
</entry>
<entry>6</entry>
@@ -720,7 +720,7 @@
<row>
<entry><function>options</function></entry>
<entry>
Defines {+a+} set of options that are specific [-for-]{+to+} this operator class
(optional)
</entry>
<entry>7</entry>
@@ -778,7 +778,7 @@
<row>
<entry><function>options</function></entry>
<entry>
Defines {+a+} set of options that are specific [-for-]{+to+} this operator class
(optional)
</entry>
<entry>5</entry>