Update indexam.sgml

Author: chegong18

postgresql/doc/src/sgml/indexam.sgml

@@ -139,6 +139,8 @@ typedef struct IndexAmRoutine
     uint16      amstrategies;
     /* total number of support functions that this AM uses */
     uint16      amsupport;
+    /* opclass options support function number or 0 */
+    uint16      amoptsprocnum;
     /* does AM support ORDER BY indexed column's value? */
     bool        amcanorder;
     /* does AM support ORDER BY result of an operator on indexed column? */
@@ -165,6 +167,10 @@ typedef struct IndexAmRoutine
     bool        amcanparallel;
     /* does AM support columns included with clause INCLUDE? */
     bool        amcaninclude;
+    /* does AM use maintenance_work_mem? */
+    bool        amusemaintenanceworkmem;
+    /* OR of parallel vacuum flags */
+    uint8       amparallelvacuumoptions;
     /* type of data stored in index, or InvalidOid if variable */
     Oid         amkeytype;
 
@@ -210,6 +216,8 @@ typedef struct IndexAmRoutine
     uint16      amstrategies;
     /* total number of support functions that this AM uses */
     uint16      amsupport;
+    /* opclass options support function number or 0 */
+    uint16      amoptsprocnum;
     /* does AM support ORDER BY indexed column's value? */
     bool        amcanorder;
     /* does AM support ORDER BY result of an operator on indexed column? */
@@ -236,6 +244,10 @@ typedef struct IndexAmRoutine
     bool        amcanparallel;
     /* does AM support columns included with clause INCLUDE? */
     bool        amcaninclude;
+    /* does AM use maintenance_work_mem? */
+    bool        amusemaintenanceworkmem;
+    /* OR of parallel vacuum flags */
+    uint8       amparallelvacuumoptions;
     /* type of data stored in index, or InvalidOid if variable */
     Oid         amkeytype;
 
@@ -604,7 +616,7 @@ amcanreturn (Relation indexRelation, int attno);
    linkend="indexes-index-only-scans"><firstterm>index-only scans</firstterm></link> on
    the given column, by returning the indexed column values for an index entry
    in the form of an <structname>IndexTuple</structname>.  The attribute number
-   is 1-based, i.e. the first column's attno is 1. Returns true if supported,
+   is 1-based, i.e., the first column's attno is 1. Returns true if supported,
    else false.  If the access method does not support index-only scans at all,
    the <structfield>amcanreturn</structfield> field in its <structname>IndexAmRoutine</structname>
    struct can be set to NULL.
@@ -684,7 +696,7 @@ amoptions (ArrayType *reloptions,
 </programlisting>
    分析和验证一个索引的 reloptions 数组。仅当一个索引存在非空 reloptions 数组时才会被调用。<parameter>reloptions</parameter>是一个<type>text</type>数组，包含<replaceable>name</replaceable><literal>=</literal><replaceable>value</replaceable>形式的项。 该函数应当构建一个<type>bytea</type>值，该值将被拷贝进索引的 relcache 项的<structfield>rd_options</structfield>域。<type>bytea</type>值的数据内容是开放由访问方法定义的， 大部分的标准访问方法都使用<structname>StdRdOptions</structname>结构。当<parameter>validate</parameter>为真时，如果任何一个选项都不可识别或者含有非法值，该函数都应当报告一个适当的错误消息；当<parameter>validate</parameter>为假时，非法 项应该被安静地忽略（当正在载入的选项已经在<structname>pg_catalog</structname>中时， <parameter>validate</parameter>为假；仅在访问方法已经改变了选项的规则时才可能找 到非法项，并且在此情况下忽略废弃的项是合适的）。如果想要默认行为，那么返回 NULL 也 OK。
   </para>
-  
+
 <!--==========================orignal english content==========================
   <para>
 <programlisting>
@@ -889,7 +901,7 @@ amgettuple (IndexScanDesc scan,
    will pass the caller's snapshot test.  On success, <function>amgettuple</function>
    must also set <literal>scan-&gt;xs_recheck</literal> to true or false.
    False means it is certain that the index entry matches the scan keys.
-   true means this is not certain, and the conditions represented by the
+   True means this is not certain, and the conditions represented by the
    scan keys must be rechecked against the heap tuple after fetching it.
    This provision supports <quote>lossy</quote> index operators.
    Note that rechecking will extend only to the scan conditions; a partial
@@ -1025,7 +1037,7 @@ ammarkpos (IndexScanDesc scan);
 </programlisting>
    标记当前扫描位置。访问方法只需要支持每个扫描里面有一个被标记的扫描位置。
   </para>
-  
+
 <!--==========================orignal english content==========================
   <para>
    The <function>ammarkpos</function> function need only be provided if the access