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| <div class="subTitle">org.apache.hadoop.mapred.join</div> |
| <h2 title="Class Parser" class="title">Class Parser</h2> |
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| <pre>@InterfaceAudience.Public |
| @InterfaceStability.Evolving |
| public class <span class="typeNameLabel">Parser</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></pre> |
| <div class="block">Very simple shift-reduce parser for join expressions. |
| |
| This should be sufficient for the user extension permitted now, but ought to |
| be replaced with a parser generator if more complex grammars are supported. |
| In particular, this "shift-reduce" parser has no states. Each set |
| of formals requires a different internal node type, which is responsible for |
| interpreting the list of tokens it receives. This is sufficient for the |
| current grammar, but it has several annoying properties that might inhibit |
| extension. In particular, parenthesis are always function calls; an |
| algebraic or filter grammar would not only require a node type, but must |
| also work around the internals of this parser. |
| |
| For most other cases, adding classes to the hierarchy- particularly by |
| extending JoinRecordReader and MultiFilterRecordReader- is fairly |
| straightforward. One need only override the relevant method(s) (usually only |
| <a href="../../../../../org/apache/hadoop/mapred/join/CompositeRecordReader.html#combine-java.lang.Object:A-org.apache.hadoop.mapred.join.TupleWritable-"><code>CompositeRecordReader.combine(java.lang.Object[], org.apache.hadoop.mapred.join.TupleWritable)</code></a>) and include a property to map its |
| value to an identifier in the parser.</div> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/join/Parser.Node.html" title="class in org.apache.hadoop.mapred.join">Parser.Node</a></span></code> </td> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/join/Parser.NodeToken.html" title="class in org.apache.hadoop.mapred.join">Parser.NodeToken</a></span></code> </td> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/join/Parser.NumToken.html" title="class in org.apache.hadoop.mapred.join">Parser.NumToken</a></span></code> </td> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/join/Parser.StrToken.html" title="class in org.apache.hadoop.mapred.join">Parser.StrToken</a></span></code> </td> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/join/Parser.Token.html" title="class in org.apache.hadoop.mapred.join">Parser.Token</a></span></code> |
| <div class="block">Tagged-union type for tokens from the join expression.</div> |
| </td> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hadoop/mapred/join/Parser.TType.html" title="enum in org.apache.hadoop.mapred.join">Parser.TType</a></span></code> </td> |
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| <h4>Parser</h4> |
| <pre>public Parser()</pre> |
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