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<div class="subTitle">org.apache.orc.impl</div>
<h2 title="Class SchemaEvolution" class="title">Class SchemaEvolution</h2>
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<pre>public class <span class="typeNameLabel">SchemaEvolution</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">Infer and track the evolution between the schema as stored in the file and
 the schema that has been requested by the reader.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Class and Description</th>
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<tr class="altColor">
<td class="colFirst"><code>static class&nbsp;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.IllegalEvolutionException.html" title="class in org.apache.orc.impl">SchemaEvolution.IllegalEvolutionException</a></span></code>&nbsp;</td>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#SchemaEvolution-org.apache.orc.TypeDescription-boolean:A-">SchemaEvolution</a></span>(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;fileSchema,
               boolean[]&nbsp;readerIncluded)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#SchemaEvolution-org.apache.orc.TypeDescription-org.apache.orc.TypeDescription-boolean:A-">SchemaEvolution</a></span>(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;fileSchema,
               <a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;readerSchema,
               boolean[]&nbsp;readerIncluded)</code>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<td class="colOne"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#SchemaEvolution-org.apache.orc.TypeDescription-org.apache.orc.TypeDescription-org.apache.orc.Reader.Options-">SchemaEvolution</a></span>(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;fileSchema,
               <a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;readerSchema,
               <a href="../../../../org/apache/orc/Reader.Options.html" title="class in org.apache.orc">Reader.Options</a>&nbsp;options)</code>&nbsp;</td>
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<td class="colFirst"><code>static boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#checkAcidSchema-org.apache.orc.TypeDescription-">checkAcidSchema</a></span>(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;type)</code>&nbsp;</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#createEventSchema-org.apache.orc.TypeDescription-">createEventSchema</a></span>(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;typeDescr)</code>&nbsp;</td>
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<tr id="i2" class="altColor">
<td class="colFirst"><code>static <a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#getBaseRow-org.apache.orc.TypeDescription-">getBaseRow</a></span>(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;typeDescription)</code>
<div class="block">Get the underlying base row from an ACID event struct.</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>boolean[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#getFileIncluded--">getFileIncluded</a></span>()</code>
<div class="block">Get whether each column is included from the file's point of view.</div>
</td>
</tr>
<tr id="i4" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#getFileSchema--">getFileSchema</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code><a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#getFileType-int-">getFileType</a></span>(int&nbsp;id)</code>
<div class="block">Get the file type by reader type id.</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#getFileType-org.apache.orc.TypeDescription-">getFileType</a></span>(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;readerType)</code>&nbsp;</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#getPositionalColumns--">getPositionalColumns</a></span>()</code>
<div class="block">Get whether the columns are handled via position or name</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#getReaderBaseSchema--">getReaderBaseSchema</a></span>()</code>
<div class="block">Returns the non-ACID (aka base) reader type description.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code>boolean[]</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#getReaderIncluded--">getReaderIncluded</a></span>()</code>
<div class="block">Get whether each column is included from the reader's point of view.</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code><a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#getReaderSchema--">getReaderSchema</a></span>()</code>&nbsp;</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#hasConversion--">hasConversion</a></span>()</code>
<div class="block">Is there Schema Evolution data type conversion?</div>
</td>
</tr>
<tr id="i12" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#includeReaderColumn-int-">includeReaderColumn</a></span>(int&nbsp;readerId)</code>
<div class="block">Should we read the given reader column?</div>
</td>
</tr>
<tr id="i13" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#isOnlyImplicitConversion--">isOnlyImplicitConversion</a></span>()</code>
<div class="block">When there Schema Evolution data type conversion i.e.</div>
</td>
</tr>
<tr id="i14" class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#isPPDSafeConversion-int-">isPPDSafeConversion</a></span>(int&nbsp;fileColId)</code>
<div class="block">Check if column is safe for ppd evaluation</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/orc/impl/SchemaEvolution.html#isSchemaEvolutionCaseAware--">isSchemaEvolutionCaseAware</a></span>()</code>&nbsp;</td>
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<h3>Methods inherited from class&nbsp;java.lang.<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></h3>
<code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#clone--" title="class or interface in java.lang">clone</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#equals-java.lang.Object-" title="class or interface in java.lang">equals</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#finalize--" title="class or interface in java.lang">finalize</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#getClass--" title="class or interface in java.lang">getClass</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#hashCode--" title="class or interface in java.lang">hashCode</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notify--" title="class or interface in java.lang">notify</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#notifyAll--" title="class or interface in java.lang">notifyAll</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#toString--" title="class or interface in java.lang">toString</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait--" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-" title="class or interface in java.lang">wait</a>, <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true#wait-long-int-" title="class or interface in java.lang">wait</a></code></li>
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<h4>SchemaEvolution</h4>
<pre>public&nbsp;SchemaEvolution(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;fileSchema,
                       <a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;readerSchema,
                       <a href="../../../../org/apache/orc/Reader.Options.html" title="class in org.apache.orc">Reader.Options</a>&nbsp;options)</pre>
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<h4>SchemaEvolution</h4>
<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;SchemaEvolution(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;fileSchema,
                                   boolean[]&nbsp;readerIncluded)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Deprecated.html?is-external=true" title="class or interface in java.lang">@Deprecated</a>
public&nbsp;SchemaEvolution(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;fileSchema,
                                   <a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;readerSchema,
                                   boolean[]&nbsp;readerIncluded)</pre>
<div class="block"><span class="deprecatedLabel">Deprecated.</span>&nbsp;</div>
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<h4>isSchemaEvolutionCaseAware</h4>
<pre>public&nbsp;boolean&nbsp;isSchemaEvolutionCaseAware()</pre>
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<h4>getReaderSchema</h4>
<pre>public&nbsp;<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;getReaderSchema()</pre>
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<pre>public&nbsp;<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;getReaderBaseSchema()</pre>
<div class="block">Returns the non-ACID (aka base) reader type description.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the reader type ignoring the ACID rowid columns, if any</dd>
</dl>
</li>
</ul>
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<h4>hasConversion</h4>
<pre>public&nbsp;boolean&nbsp;hasConversion()</pre>
<div class="block">Is there Schema Evolution data type conversion?</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
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<h4>isOnlyImplicitConversion</h4>
<pre>public&nbsp;boolean&nbsp;isOnlyImplicitConversion()</pre>
<div class="block">When there Schema Evolution data type conversion i.e. hasConversion() returns true,
 is the conversion only the implicit kind?

 (see aaa).</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
</dl>
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<a name="getFileSchema--">
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<h4>getFileSchema</h4>
<pre>public&nbsp;<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;getFileSchema()</pre>
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<h4>getFileType</h4>
<pre>public&nbsp;<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;getFileType(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;readerType)</pre>
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<pre>public&nbsp;<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;getFileType(int&nbsp;id)</pre>
<div class="block">Get the file type by reader type id.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>id</code> - reader column id</dd>
<dt><span class="returnLabel">Returns:</span></dt>
</dl>
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<pre>public&nbsp;boolean[]&nbsp;getReaderIncluded()</pre>
<div class="block">Get whether each column is included from the reader's point of view.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a boolean array indexed by reader column id</dd>
</dl>
</li>
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<pre>public&nbsp;boolean[]&nbsp;getFileIncluded()</pre>
<div class="block">Get whether each column is included from the file's point of view.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a boolean array indexed by file column id</dd>
</dl>
</li>
</ul>
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<h4>getPositionalColumns</h4>
<pre>public&nbsp;boolean&nbsp;getPositionalColumns()</pre>
<div class="block">Get whether the columns are handled via position or name</div>
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<pre>public&nbsp;boolean&nbsp;isPPDSafeConversion(int&nbsp;fileColId)</pre>
<div class="block">Check if column is safe for ppd evaluation</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>fileColId</code> - file column id</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the specified column is safe for ppd evaluation else false</dd>
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<pre>public&nbsp;boolean&nbsp;includeReaderColumn(int&nbsp;readerId)</pre>
<div class="block">Should we read the given reader column?</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>readerId</code> - the id of column in the extended reader schema</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the column should be read</dd>
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<pre>public static&nbsp;boolean&nbsp;checkAcidSchema(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;type)</pre>
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<pre>public static&nbsp;<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;createEventSchema(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;typeDescr)</pre>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>typeDescr</code> - </dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>ORC types for the ACID event based on the row's type description</dd>
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<pre>public static&nbsp;<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;getBaseRow(<a href="../../../../org/apache/orc/TypeDescription.html" title="class in org.apache.orc">TypeDescription</a>&nbsp;typeDescription)</pre>
<div class="block">Get the underlying base row from an ACID event struct.</div>
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<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>typeDescription</code> - the ACID event schema.</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the subtype for the real row</dd>
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