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| <div class="subTitle"><span class="packageLabelInType">Package</span> <a href="package-summary.html">org.apache.calcite.rel.type</a></div> |
| <h2 title="Enum StructKind" class="title">Enum StructKind</h2> |
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| <li>java.lang.Object</li> |
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| <li>java.lang.Enum<<a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a>></li> |
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| <ul class="inheritance"> |
| <li>org.apache.calcite.rel.type.StructKind</li> |
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| <dd><code>java.io.Serializable</code>, <code>java.lang.Comparable<<a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a>></code></dd> |
| </dl> |
| <hr> |
| <pre>public enum <span class="typeNameLabel">StructKind</span> |
| extends java.lang.Enum<<a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a>></pre> |
| <div class="block">Describes a policy for resolving fields in record types. |
| |
| <p>The usual value is <a href="#FULLY_QUALIFIED"><code>FULLY_QUALIFIED</code></a>. |
| |
| <p>A field whose record type is labeled <a href="#PEEK_FIELDS"><code>PEEK_FIELDS</code></a> can be omitted. |
| In Phoenix, column families are represented by fields like this. |
| <a href="#PEEK_FIELDS_DEFAULT"><code>PEEK_FIELDS_DEFAULT</code></a> is similar, but represents the default column |
| family, so it will win in the event of a tie. |
| |
| <p>SQL usually disallows a record type. For instance, |
| |
| <blockquote><pre>SELECT address.zip FROM Emp AS e</pre></blockquote> |
| |
| <p>is disallowed because <code>address</code> "looks like" a table alias. You'd |
| have to write |
| |
| <blockquote><pre>SELECT e.address.zip FROM Emp AS e</pre></blockquote> |
| |
| <p>But if a table has one or more columns that are record-typed and are |
| labeled <a href="#PEEK_FIELDS"><code>PEEK_FIELDS</code></a> or <a href="#PEEK_FIELDS_DEFAULT"><code>PEEK_FIELDS_DEFAULT</code></a> we suspend that |
| rule and would allow <code>address.zip</code>. |
| |
| <p>If there are multiple matches, we choose the one that is: |
| <ol> |
| <li>Shorter. If you write <code>zipcode</code>, <code>address.zipcode</code> will |
| be preferred over <code>product.supplier.zipcode</code>. |
| <li>Uses as little skipping as possible. A match that is fully-qualified |
| will beat one that uses <code>PEEK_FIELDS_DEFAULT</code> at some point, which |
| will beat one that uses <code>PEEK_FIELDS</code> at some point. |
| </ol></div> |
| </li> |
| </ul> |
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| <h3>Enum Constant Summary</h3> |
| <table class="memberSummary"> |
| <caption><span>Enum Constants</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Enum Constant</th> |
| <th class="colLast" scope="col">Description</th> |
| </tr> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#FULLY_QUALIFIED">FULLY_QUALIFIED</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">This is a traditional structured type, where each field must be |
| referenced explicitly.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#NONE">NONE</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">This is not a structured type.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#PEEK_FIELDS">PEEK_FIELDS</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">If a field has this type, you can see its fields without qualifying them |
| with the name of this field.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#PEEK_FIELDS_DEFAULT">PEEK_FIELDS_DEFAULT</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">As <a href="#PEEK_FIELDS"><code>PEEK_FIELDS</code></a>, but takes priority if another struct-typed |
| field also has a field of the name being sought.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <th class="colFirst" scope="row"><code><span class="memberNameLink"><a href="#PEEK_FIELDS_NO_EXPAND">PEEK_FIELDS_NO_EXPAND</a></span></code></th> |
| <td class="colLast"> |
| <div class="block">As <a href="#PEEK_FIELDS"><code>PEEK_FIELDS</code></a>, but fields are not expanded in "SELECT *".</div> |
| </td> |
| </tr> |
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| <th class="colFirst" scope="col">Modifier</th> |
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| <td class="colFirst"><code>private </code></td> |
| <th class="colConstructorName" scope="row"><code><span class="memberNameLink"><a href="#%3Cinit%3E()">StructKind</a></span>()</code></th> |
| <td class="colLast"> </td> |
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| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code>static <a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a></code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#valueOf(java.lang.String)">valueOf</a></span>​(java.lang.String name)</code></th> |
| <td class="colLast"> |
| <div class="block">Returns the enum constant of this type with the specified name.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code>static <a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a>[]</code></td> |
| <th class="colSecond" scope="row"><code><span class="memberNameLink"><a href="#values()">values</a></span>()</code></th> |
| <td class="colLast"> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared.</div> |
| </td> |
| </tr> |
| </table> |
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| </a> |
| <h3>Methods inherited from class java.lang.Enum</h3> |
| <code>clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf</code></li> |
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| <code>getClass, notify, notifyAll, wait, wait, wait</code></li> |
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| </section> |
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| <h4>NONE</h4> |
| <pre>public static final <a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a> NONE</pre> |
| <div class="block">This is not a structured type.</div> |
| </li> |
| </ul> |
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| <!-- --> |
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| <h4>FULLY_QUALIFIED</h4> |
| <pre>public static final <a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a> FULLY_QUALIFIED</pre> |
| <div class="block">This is a traditional structured type, where each field must be |
| referenced explicitly. |
| |
| <p>Also, when referencing a struct column, you |
| need to qualify it with the table alias, per standard SQL. For instance, |
| <code>SELECT c.address.zipcode FROM customer AS c</code> |
| is valid but |
| <code>SELECT address.zipcode FROM customer</code> |
| it not valid.</div> |
| </li> |
| </ul> |
| <a id="PEEK_FIELDS_DEFAULT"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>PEEK_FIELDS_DEFAULT</h4> |
| <pre>public static final <a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a> PEEK_FIELDS_DEFAULT</pre> |
| <div class="block">As <a href="#PEEK_FIELDS"><code>PEEK_FIELDS</code></a>, but takes priority if another struct-typed |
| field also has a field of the name being sought. |
| |
| <p>In Phoenix, only one of a table's columns is labeled |
| <code>PEEK_FIELDS_DEFAULT</code> - the default column family - but in principle |
| there could be more than one.</div> |
| </li> |
| </ul> |
| <a id="PEEK_FIELDS"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>PEEK_FIELDS</h4> |
| <pre>public static final <a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a> PEEK_FIELDS</pre> |
| <div class="block">If a field has this type, you can see its fields without qualifying them |
| with the name of this field. |
| |
| <p>For example, if <code>address</code> is labeled <code>PEEK_FIELDS</code>, you |
| could write <code>zipcode</code> as shorthand for <code>address.zipcode</code>.</div> |
| </li> |
| </ul> |
| <a id="PEEK_FIELDS_NO_EXPAND"> |
| <!-- --> |
| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>PEEK_FIELDS_NO_EXPAND</h4> |
| <pre>public static final <a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a> PEEK_FIELDS_NO_EXPAND</pre> |
| <div class="block">As <a href="#PEEK_FIELDS"><code>PEEK_FIELDS</code></a>, but fields are not expanded in "SELECT *". |
| |
| <p>Used in Flink, not Phoenix.</div> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <h4>StructKind</h4> |
| <pre>private StructKind()</pre> |
| </li> |
| </ul> |
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| <h4>values</h4> |
| <pre class="methodSignature">public static <a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a>[] values()</pre> |
| <div class="block">Returns an array containing the constants of this enum type, in |
| the order they are declared. This method may be used to iterate |
| over the constants as follows: |
| <pre> |
| for (StructKind c : StructKind.values()) |
| System.out.println(c); |
| </pre></div> |
| <dl> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>an array containing the constants of this enum type, in the order they are declared</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>valueOf</h4> |
| <pre class="methodSignature">public static <a href="StructKind.html" title="enum in org.apache.calcite.rel.type">StructKind</a> valueOf​(java.lang.String name)</pre> |
| <div class="block">Returns the enum constant of this type with the specified name. |
| The string must match <i>exactly</i> an identifier used to declare an |
| enum constant in this type. (Extraneous whitespace characters are |
| not permitted.)</div> |
| <dl> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>name</code> - the name of the enum constant to be returned.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the enum constant with the specified name</dd> |
| <dt><span class="throwsLabel">Throws:</span></dt> |
| <dd><code>java.lang.IllegalArgumentException</code> - if this enum type has no constant with the specified name</dd> |
| <dd><code>java.lang.NullPointerException</code> - if the argument is null</dd> |
| </dl> |
| </li> |
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