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Matching up XML query expression for XML table index lookup during query rewrite
Matching up XML query expression for XML table index lookup during query rewrite
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机译：在查询重写期间匹配XML查询表达式以进行XML表索引查找
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摘要
Techniques are provided for determining whether an XML table index may be used when executing an XML query. An XML table index is defined with a row pattern expression and one or more column pattern expressions. In one technique, an index expression is generated for each row pattern expression-column pattern expression combination. An expression included in the XML query (“query expression”) is compared against one or more of the index expressions. In another technique, even if a query expression does not exactly match a row pattern expression, it is determined whether the query expression is equivalent to the row pattern expression. In another technique, even if a query expression does not exactly match and a row pattern expression, it is determined whether the query expression is “contained by” the row pattern expression.
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