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| <h2 title="Class FilterParser" class="title">Class FilterParser</h2> |
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| <ul class="inheritance"> |
| <li>java.lang.Object</li> |
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| <li>org.apache.hawq.pxf.api.FilterParser</li> |
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| <pre>public class <span class="typeNameLabel">FilterParser</span> |
| extends java.lang.Object</pre> |
| <div class="block">The parser code which goes over a filter string and pushes operands onto a stack. |
| Once an operation is read, the evaluate function is called for the <a href="../../../../../org/apache/hawq/pxf/api/FilterParser.FilterBuilder.html" title="interface in org.apache.hawq.pxf.api"><code>FilterParser.FilterBuilder</code></a> |
| interface with two pop-ed operands. |
| <br> |
| A string of filters looks like this: |
| <code>a2c5o1a1c"abc"o2o7</code> |
| which means <code>column#2 < 5 AND column#1 > "abc"</code> |
| <br> |
| It is a RPN serialized representation of a filters tree in GPDB where |
| <ul> |
| <li> a means an attribute (column)</li> |
| <li>c means a constant (either string or numeric)</li> |
| <li>o means operator</li> |
| </ul> |
| |
| Assuming all operators are binary, RPN representation allows it to be read left to right easily. |
| <br> |
| FilterParser only knows about columns and constants. The rest is up to the <a href="../../../../../org/apache/hawq/pxf/api/FilterParser.FilterBuilder.html" title="interface in org.apache.hawq.pxf.api"><code>FilterParser.FilterBuilder</code></a> implementer. |
| FilterParser makes sure column objects are always on the left of the expression (when relevant).</div> |
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| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hawq/pxf/api/FilterParser.BasicFilter.html" title="class in org.apache.hawq.pxf.api">FilterParser.BasicFilter</a></span></code> |
| <div class="block">Basic filter provided for cases where the target storage system does not provide it own filter |
| For example: Hbase storage provides its own filter but for a Writable based record in a |
| SequenceFile there is no filter provided and so we need to have a default</div> |
| </td> |
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| <tr class="rowColor"> |
| <td class="colFirst"><code>class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hawq/pxf/api/FilterParser.ColumnIndex.html" title="class in org.apache.hawq.pxf.api">FilterParser.ColumnIndex</a></span></code> |
| <div class="block">Represents a column index.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hawq/pxf/api/FilterParser.Constant.html" title="class in org.apache.hawq.pxf.api">FilterParser.Constant</a></span></code> |
| <div class="block">Represents a constant object (String, Long, ...).</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>static interface </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hawq/pxf/api/FilterParser.FilterBuilder.html" title="interface in org.apache.hawq.pxf.api">FilterParser.FilterBuilder</a></span></code> |
| <div class="block">Interface a user of FilterParser should implement.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hawq/pxf/api/FilterParser.Operation.html" title="enum in org.apache.hawq.pxf.api">FilterParser.Operation</a></span></code> |
| <div class="block">Supported operations by the parser.</div> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/hawq/pxf/api/FilterParser.html#FilterParser-org.apache.hawq.pxf.api.FilterParser.FilterBuilder-">FilterParser</a></span>(<a href="../../../../../org/apache/hawq/pxf/api/FilterParser.FilterBuilder.html" title="interface in org.apache.hawq.pxf.api">FilterParser.FilterBuilder</a> eval)</code> |
| <div class="block">Constructs a FilterParser.</div> |
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| <td class="colFirst"><code>java.lang.Object</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/hawq/pxf/api/FilterParser.html#parse-java.lang.String-">parse</a></span>(java.lang.String filter)</code> |
| <div class="block">Parses the string filter.</div> |
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| <h4>FilterParser</h4> |
| <pre>public FilterParser(<a href="../../../../../org/apache/hawq/pxf/api/FilterParser.FilterBuilder.html" title="interface in org.apache.hawq.pxf.api">FilterParser.FilterBuilder</a> eval)</pre> |
| <div class="block">Constructs a FilterParser.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>eval</code> - the filter builder</dd> |
| </dl> |
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| <h4>parse</h4> |
| <pre>public java.lang.Object parse(java.lang.String filter) |
| throws java.lang.Exception</pre> |
| <div class="block">Parses the string filter.</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>filter</code> - the filter to parse</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the parsed filter</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.Exception</code> - if the filter string had wrong syntax</dd> |
| </dl> |
| </li> |
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