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Merge pull request #426 from linjialiang/master
xindex.sgml 文件翻译完成
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‎postgresql/doc/src/sgml/xindex.sgml

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@@ -695,7 +695,7 @@ ____________________________________________________________________________-->
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</tbody>
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</tgroup>
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</table>
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<!--==========================orignal english content==========================
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<para>
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Notice that all the operators listed above return Boolean values. In
@@ -861,15 +861,15 @@ ____________________________________________________________________________-->
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<!--==========================orignal english content==========================
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<row>
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<entry>
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Defines a set of options that are specific to this operator class
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Define options that are specific to this operator class
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(optional)
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</entry>
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<entry>5</entry>
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</row>
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____________________________________________________________________________-->
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<row>
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<entry>
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定义一组特定于此运算符类的选项（可选）
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定义特定于此运算符类的选项（可选）
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</entry>
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<entry>5</entry>
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</row>
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<!--==========================orignal english content==========================
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<row>
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<entry>
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Defines a set of options that are specific to this operator class
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Define options that are specific to this operator class
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(optional)
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</entry>
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<entry>3</entry>
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</row>
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____________________________________________________________________________-->
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<row>
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<entry>
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定义一组特定于此运算符类的选项（可选）
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定义特定于此运算符类的选项（可选）
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</entry>
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<entry>3</entry>
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</row>
@@ -957,13 +957,13 @@ ____________________________________________________________________________-->
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<!--==========================orignal english content==========================
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<para>
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GiST indexes have ten support functions, three of which are optional,
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GiST indexes have eleven support functions, six of which are optional,
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as shown in <xref linkend="xindex-gist-support-table"/>.
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(For more information see <xref linkend="gist"/>.)
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</para>
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____________________________________________________________________________-->
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<para>
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如<xref linkend="xindex-gist-support-table"/>所示，GiST 索引有十个支持函数，其中三个是可选的（详见<xref linkend="gist"/>）。
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如<xref linkend="xindex-gist-support-table"/>所示，GiST 索引有11个支持函数，其中6个是可选的（详见<xref linkend="gist"/>）。
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</para>
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<table tocentry="1" id="xindex-gist-support-table">
@@ -1019,26 +1019,26 @@ ____________________________________________________________________________-->
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<row>
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<entry><function>compress</function></entry>
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<entry>compute a compressed representation of a key or value
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to be indexed</entry>
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to be indexed (optional)</entry>
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<entry>3</entry>
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</row>
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____________________________________________________________________________-->
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<row>
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<entry><function>compress</function></entry>
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<entry>计算一个要被索引的键或值的压缩表达</entry>
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<entry>计算一个要被索引的键或值的压缩表达 (可选)</entry>
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<entry>3</entry>
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</row>
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<!--==========================orignal english content==========================
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<row>
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<entry><function>decompress</function></entry>
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<entry>compute a decompressed representation of a
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compressed key</entry>
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compressed key (optional)</entry>
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<entry>4</entry>
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</row>
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____________________________________________________________________________-->
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<row>
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<entry><function>decompress</function></entry>
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<entry>计算一个压缩键的解压表达</entry>
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<entry>计算一个压缩键的解压表达 (可选)</entry>
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<entry>4</entry>
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</row>
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<!--==========================orignal english content==========================
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</row>
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<!--==========================orignal english content==========================
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<row>
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<entry><function>equal</function></entry>
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<entry><function>same</function></entry>
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<entry>compare two keys and return true if they are equal</entry>
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<entry>7</entry>
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</row>
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____________________________________________________________________________-->
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<row>
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<entry><function>equal</function></entry>
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<entry><function>same</function></entry>
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<entry>比较两个键并且在它们相等时返回真</entry>
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<entry>7</entry>
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</row>
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<!--==========================orignal english content==========================
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<row>
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<entry><function>options</function></entry>
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<entry>
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Defines a set of options that are specific to this operator class
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(optional)
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</entry>
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<entry>define options that are specific to this operator class
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(optional)</entry>
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<entry>10</entry>
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</row>
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____________________________________________________________________________-->
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<row>
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<entry><function>options</function></entry>
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<entry>
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定义一组特定于此运算符类的选项（可选）
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</entry>
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<entry>定义特定于此运算符类的选项
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（可选）</entry>
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<entry>10</entry>
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</row>
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<!--==========================orignal english content==========================
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<row>
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<entry><function>sortsupport</function></entry>
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<entry>provide a sort comparator to be used in fast index builds
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(optional)</entry>
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<entry>11</entry>
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</row>
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____________________________________________________________________________-->
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<row>
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<entry><function>sortsupport</function></entry>
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<entry>提供一个用于快速索引构建的排序比较器
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（可选）</entry>
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<entry>11</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<!--==========================orignal english content==========================
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<row>
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<entry><function>options</function></entry>
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<entry>
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Defines a set of options that are specific to this operator class
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(optional)
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</entry>
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<entry>define options that are specific to this operator class
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(optional)</entry>
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<entry>6</entry>
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</row>
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____________________________________________________________________________-->
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<row>
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<entry><function>options</function></entry>
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<entry>
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定义一组特定于此运算符类的选项（可选）
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</entry>
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<entry>定义特定于此运算符类的选项
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（可选）</entry>
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<entry>6</entry>
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</row>
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</tbody>
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<row>
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<entry><function>options</function></entry>
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<entry>
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Defines a set of options that are specific to this operator class
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define options that are specific to this operator class
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(optional)
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</entry>
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<entry>7</entry>
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<row>
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<entry><function>options</function></entry>
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<entry>
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定义一组特定于此运算符类的选项（可选）
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定义特定于此运算符类的选项（可选）
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</entry>
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<entry>7</entry>
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</row>
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<row>
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<entry><function>options</function></entry>
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Defines a set of options that are specific to this operator class
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define options that are specific to this operator class
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(optional)
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</entry>
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<entry>5</entry>
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<entry><function>options</function></entry>
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定义一组特定于此运算符类的选项（可选）
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定义特定于此运算符类的选项（可选）
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</entry>
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<entry>5</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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<!--==========================orignal english content==========================
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<para>
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Unlike search operators, support functions return whichever data
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<para>
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GiST、SP-GiST 和 GIN 索引没有任何明显的跨数据类型操作的概念。它们所支持的操作符集合就是一个给定操作符类能够处理的主要支持函数。
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</para>
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<!--==========================orignal english content==========================
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<para>
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In BRIN, the requirements depends on the framework that provides the
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STORAGE box;
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</programlisting>
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At present, only the GiST, GIN and BRIN index methods support a
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At present, only the GiST, SP-GiST, GIN and BRIN index methods support a
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<literal>STORAGE</literal> type that's different from the column data type.
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The GiST <function>compress</function> and <function>decompress</function> support
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routines must deal with data-type conversion when <literal>STORAGE</literal>
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is used. In GIN, the <literal>STORAGE</literal> type identifies the type of
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is used. SP-GiST likewise requires a <function>compress</function>
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support function to convert to the storage type, when that is different;
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if an SP-GiST opclass also supports retrieving data, the reverse
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conversion must be handled by the <function>consistent</function> function.
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In GIN, the <literal>STORAGE</literal> type identifies the type of
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the <quote>key</quote> values, which normally is different from the type
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of the indexed column &mdash; for example, an operator class for
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integer-array columns might have keys that are just integers. The
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STORAGE box;
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</programlisting>
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当前，只有 GiST、GIN 和 BRIN 索引方法支持不同于列数据类型的<literal>STORAGE</literal>类型。在使用<literal>STORAGE</literal>时，GiST 的支持例程<function>compress</function>和<function>decompress</function>必须处理数据类型转换。在 GIN 中，<literal>STORAGE</literal>类型标识<quote>key</quote>值的类型，它通常不同于被索引列的类型 &mdash; 例如，一个用于整数数组列的操作符类可能具有整数键值。GIN 的支持例程<function>extractValue</function>和<function>extractQuery</function>负责从被索引值中抽取键。BRIN 类似于 GIN：<literal>STORAGE</literal>类型标识被存储的摘要值的类型，而操作符类的支持过程负责正确解释摘要值。
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当前，只有 GiST、SP-GiST、GIN 和 BRIN 索引方法支持不同于列数据类型的<literal>STORAGE</literal>类型。在使用<literal>STORAGE</literal>时，GiST 的支持例程<function>compress</function>和<function>decompress</function>必须处理数据类型转换。SP-GiST 同样需要 <function>compress</function> 支持函数来转换为存储类型（当存储类型不同时）； 如果 SP-GiST opclass 也支持检索数据，则反向转换必须由 <function>consistant</function> 函数处理。在 GIN 中，<literal>STORAGE</literal>类型标识<quote>key</quote>值的类型，它通常不同于被索引列的类型 &mdash; 例如，一个用于整数数组列的操作符类可能具有整数键值。GIN 的支持例程<function>extractValue</function>和<function>extractQuery</function>负责从被索引值中抽取键。BRIN 类似于 GIN：<literal>STORAGE</literal>类型标识被存储的摘要值的类型，而操作符类的支持过程负责正确解释摘要值。
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</para>
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</sect2>
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