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| <div class="subTitle">org.apache.drill.exec.expr.fn.impl</div> |
| <h2 title="Class AbstractSqlPatternMatcher" class="title">Class AbstractSqlPatternMatcher</h2> |
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| <li>org.apache.drill.exec.expr.fn.impl.AbstractSqlPatternMatcher</li> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternMatcher.html" title="interface in org.apache.drill.exec.expr.fn.impl">SqlPatternMatcher</a></dd> |
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| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternConstantMatcher.html" title="class in org.apache.drill.exec.expr.fn.impl">SqlPatternConstantMatcher</a>, <a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternContainsMatcher.html" title="class in org.apache.drill.exec.expr.fn.impl">SqlPatternContainsMatcher</a>, <a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternEndsWithMatcher.html" title="class in org.apache.drill.exec.expr.fn.impl">SqlPatternEndsWithMatcher</a>, <a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternStartsWithMatcher.html" title="class in org.apache.drill.exec.expr.fn.impl">SqlPatternStartsWithMatcher</a></dd> |
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| <pre>public abstract class <span class="typeNameLabel">AbstractSqlPatternMatcher</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternMatcher.html" title="interface in org.apache.drill.exec.expr.fn.impl">SqlPatternMatcher</a></pre> |
| <div class="block">To get good performance for most commonly used pattern matches |
| CONSTANT('ABC') <a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternConstantMatcher.html" title="class in org.apache.drill.exec.expr.fn.impl"><code>SqlPatternConstantMatcher</code></a> |
| STARTSWITH('%ABC') <a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternStartsWithMatcher.html" title="class in org.apache.drill.exec.expr.fn.impl"><code>SqlPatternStartsWithMatcher</code></a> |
| ENDSWITH('ABC%') <a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternEndsWithMatcher.html" title="class in org.apache.drill.exec.expr.fn.impl"><code>SqlPatternEndsWithMatcher</code></a> |
| CONTAINS('%ABC%') <a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternContainsMatcher.html" title="class in org.apache.drill.exec.expr.fn.impl"><code>SqlPatternContainsMatcher</code></a> |
| we have simple pattern matchers. |
| Idea is to have our own implementation for simple pattern matchers so we can |
| avoid heavy weight regex processing, skip UTF-8 decoding and char conversion. |
| Instead, we encode the pattern string and do byte comparison against native memory. |
| Overall, this approach |
| gives us orders of magnitude performance improvement for simple pattern matches. |
| Anything that is not simple is considered |
| complex pattern and we use Java regex for complex pattern matches.</div> |
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| <td class="colFirst"><code>protected <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/AbstractSqlPatternMatcher.html#patternByteBuffer">patternByteBuffer</a></span></code> </td> |
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| <td class="colFirst"><code>protected int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/AbstractSqlPatternMatcher.html#patternLength">patternLength</a></span></code> </td> |
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| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/AbstractSqlPatternMatcher.html#patternString">patternString</a></span></code> </td> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/AbstractSqlPatternMatcher.html#AbstractSqlPatternMatcher-java.lang.String-">AbstractSqlPatternMatcher</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> patternString)</code> </td> |
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| <h3>Methods inherited from interface org.apache.drill.exec.expr.fn.impl.<a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternMatcher.html" title="interface in org.apache.drill.exec.expr.fn.impl">SqlPatternMatcher</a></h3> |
| <code><a href="../../../../../../../org/apache/drill/exec/expr/fn/impl/SqlPatternMatcher.html#match-int-int-io.netty.buffer.DrillBuf-">match</a></code></li> |
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| <a name="patternString"> |
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| <h4>patternString</h4> |
| <pre>protected final <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> patternString</pre> |
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| <h4>patternLength</h4> |
| <pre>protected final int patternLength</pre> |
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| <h4>patternByteBuffer</h4> |
| <pre>protected final <a href="https://docs.oracle.com/javase/8/docs/api/java/nio/ByteBuffer.html?is-external=true" title="class or interface in java.nio">ByteBuffer</a> patternByteBuffer</pre> |
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| <h4>AbstractSqlPatternMatcher</h4> |
| <pre>public AbstractSqlPatternMatcher(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> patternString)</pre> |
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