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<div class="subTitle">org.apache.kudu</div>
<h2 title="Class Schema" class="title">Class Schema</h2>
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<li>org.apache.kudu.Schema</li>
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<pre>@InterfaceAudience.Public
@InterfaceStability.Evolving
public class <span class="typeNameLabel">Schema</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">Represents table's schema which is essentially a list of columns.
This class offers a few utility methods for querying it.</div>
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<caption><span>Constructors</span><span class="tabEnd">&nbsp;</span></caption>
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<th class="colOne" scope="col">Constructor and Description</th>
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<tr class="altColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#Schema-java.util.List-">Schema</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>&gt;&nbsp;columns)</code>
<div class="block">Constructs a schema using the specified columns and does some internal accounting</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#Schema-java.util.List-java.util.List-">Schema</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>&gt;&nbsp;columns,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&gt;&nbsp;columnIds)</code>
<div class="block">Constructs a schema using the specified columns and IDs.</div>
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<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code><a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getColumn-java.lang.String-">getColumn</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>&nbsp;columnName)</code>
<div class="block">Get the column associated with the specified name</div>
</td>
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<tr id="i1" class="rowColor">
<td class="colFirst"><code><a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getColumnByIndex-int-">getColumnByIndex</a></span>(int&nbsp;idx)</code>
<div class="block">Get the column at the specified index in the original list</div>
</td>
</tr>
<tr id="i2" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getColumnCount--">getColumnCount</a></span>()</code>
<div class="block">Get the count of columns in this schema</div>
</td>
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<tr id="i3" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getColumnIndex-int-">getColumnIndex</a></span>(int&nbsp;columnId)</code>
<div class="block">Get the column index of the column with the provided ID.</div>
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<tr id="i4" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getColumnIndex-java.lang.String-">getColumnIndex</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>&nbsp;columnName)</code>
<div class="block">Get the index for the provided column name.</div>
</td>
</tr>
<tr id="i5" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getColumnOffset-int-">getColumnOffset</a></span>(int&nbsp;idx)</code>
<div class="block">Get the index at which this column can be found in the backing byte array</div>
</td>
</tr>
<tr id="i6" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getColumns--">getColumns</a></span>()</code>
<div class="block">Get the list of columns used to create this schema</div>
</td>
</tr>
<tr id="i7" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getPrimaryKeyColumnCount--">getPrimaryKeyColumnCount</a></span>()</code>
<div class="block">Get the count of columns that are part of the primary key.</div>
</td>
</tr>
<tr id="i8" class="altColor">
<td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getPrimaryKeyColumns--">getPrimaryKeyColumns</a></span>()</code>
<div class="block">Get the primary key columns.</div>
</td>
</tr>
<tr id="i9" class="rowColor">
<td class="colFirst"><code><a href="../../../org/apache/kudu/Schema.html" title="class in org.apache.kudu">Schema</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getRowKeyProjection--">getRowKeyProjection</a></span>()</code>
<div class="block">Get a schema that only contains the columns which are part of the key</div>
</td>
</tr>
<tr id="i10" class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getRowSize--">getRowSize</a></span>()</code>
<div class="block">Get the size a row built using this schema would be</div>
</td>
</tr>
<tr id="i11" class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#getVarLengthColumnCount--">getVarLengthColumnCount</a></span>()</code>
<div class="block">Get the count of columns with variable length (BINARY/STRING) in
this schema.</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/kudu/Schema.html#hasColumn-java.lang.String-">hasColumn</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>&nbsp;columnName)</code>
<div class="block">Returns true if the column exists.</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/kudu/Schema.html#hasColumnIds--">hasColumnIds</a></span>()</code>
<div class="block">Tells whether this schema includes IDs for columns.</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/kudu/Schema.html#hasNullableColumns--">hasNullableColumns</a></span>()</code>
<div class="block">Tells if there's at least one nullable column</div>
</td>
</tr>
<tr id="i15" class="rowColor">
<td class="colFirst"><code><a href="../../../org/apache/kudu/client/PartialRow.html" title="class in org.apache.kudu.client">PartialRow</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../org/apache/kudu/Schema.html#newPartialRow--">newPartialRow</a></span>()</code>
<div class="block">Creates a new partial row for the schema.</div>
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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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<h3>Constructor Detail</h3>
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<h4>Schema</h4>
<pre>public&nbsp;Schema(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>&gt;&nbsp;columns)</pre>
<div class="block">Constructs a schema using the specified columns and does some internal accounting</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>columns</code> - the columns in index order
See <code>ColumnPBsToSchema()</code> in <code>src/kudu/common/wire_protocol.cc</code></dd>
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<h4>Schema</h4>
<pre>public&nbsp;Schema(<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>&gt;&nbsp;columns,
<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>&gt;&nbsp;columnIds)</pre>
<div class="block">Constructs a schema using the specified columns and IDs.
This is not a stable API, prefer using <a href="../../../org/apache/kudu/Schema.html#Schema-java.util.List-"><code>Schema(List)</code></a> to create a new schema.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>columns</code> - the columns in index order</dd>
<dd><code>columnIds</code> - the column ids of the provided columns, or null</dd>
<dt><span class="throwsLabel">Throws:</span></dt>
<dd><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - If the column ids length does not match the columns length
See <code>ColumnPBsToSchema()</code> in <code>src/kudu/common/wire_protocol.cc</code></dd>
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<h4>getColumns</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>&gt;&nbsp;getColumns()</pre>
<div class="block">Get the list of columns used to create this schema</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>list of columns</dd>
</dl>
</li>
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<h4>getVarLengthColumnCount</h4>
<pre>public&nbsp;int&nbsp;getVarLengthColumnCount()</pre>
<div class="block">Get the count of columns with variable length (BINARY/STRING) in
this schema.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>strings count</dd>
</dl>
</li>
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<h4>getRowSize</h4>
<pre>public&nbsp;int&nbsp;getRowSize()</pre>
<div class="block">Get the size a row built using this schema would be</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>size in bytes</dd>
</dl>
</li>
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<h4>getColumnOffset</h4>
<pre>public&nbsp;int&nbsp;getColumnOffset(int&nbsp;idx)</pre>
<div class="block">Get the index at which this column can be found in the backing byte array</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>idx</code> - column's index</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>column's offset</dd>
</dl>
</li>
</ul>
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<h4>hasColumn</h4>
<pre>public&nbsp;boolean&nbsp;hasColumn(<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>&nbsp;columnName)</pre>
<div class="block">Returns true if the column exists.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>columnName</code> - column to search for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if the column exists</dd>
</dl>
</li>
</ul>
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<h4>getColumnIndex</h4>
<pre>public&nbsp;int&nbsp;getColumnIndex(<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>&nbsp;columnName)</pre>
<div class="block">Get the index for the provided column name.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>columnName</code> - column to search for</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>an index in the schema</dd>
</dl>
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<pre>public&nbsp;int&nbsp;getColumnIndex(int&nbsp;columnId)</pre>
<div class="block">Get the column index of the column with the provided ID.
This method is not part of the stable API.</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>columnId</code> - the column id of the column</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the column index of the column.</dd>
</dl>
</li>
</ul>
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<h4>getColumnByIndex</h4>
<pre>public&nbsp;<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>&nbsp;getColumnByIndex(int&nbsp;idx)</pre>
<div class="block">Get the column at the specified index in the original list</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>idx</code> - column's index</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the column</dd>
</dl>
</li>
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<h4>getColumn</h4>
<pre>public&nbsp;<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>&nbsp;getColumn(<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>&nbsp;columnName)</pre>
<div class="block">Get the column associated with the specified name</div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>columnName</code> - column's name</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the column</dd>
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<h4>getColumnCount</h4>
<pre>public&nbsp;int&nbsp;getColumnCount()</pre>
<div class="block">Get the count of columns in this schema</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>count of columns</dd>
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<h4>getPrimaryKeyColumnCount</h4>
<pre>public&nbsp;int&nbsp;getPrimaryKeyColumnCount()</pre>
<div class="block">Get the count of columns that are part of the primary key.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>count of primary key columns.</dd>
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<h4>getPrimaryKeyColumns</h4>
<pre>public&nbsp;<a href="https://docs.oracle.com/javase/8/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a>&lt;<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>&gt;&nbsp;getPrimaryKeyColumns()</pre>
<div class="block">Get the primary key columns.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>the primary key columns.</dd>
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<h4>getRowKeyProjection</h4>
<pre>public&nbsp;<a href="../../../org/apache/kudu/Schema.html" title="class in org.apache.kudu">Schema</a>&nbsp;getRowKeyProjection()</pre>
<div class="block">Get a schema that only contains the columns which are part of the key</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>new schema with only the keys</dd>
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<h4>hasNullableColumns</h4>
<pre>public&nbsp;boolean&nbsp;hasNullableColumns()</pre>
<div class="block">Tells if there's at least one nullable column</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>true if at least one column is nullable, else false.</dd>
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<h4>hasColumnIds</h4>
<pre>public&nbsp;boolean&nbsp;hasColumnIds()</pre>
<div class="block">Tells whether this schema includes IDs for columns. A schema created by a client as part of
table creation will not include IDs, but schemas for open tables will include IDs.
This method is not part of the stable API.</div>
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<dt><span class="returnLabel">Returns:</span></dt>
<dd>whether this schema includes column IDs.</dd>
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<pre>public&nbsp;<a href="../../../org/apache/kudu/client/PartialRow.html" title="class in org.apache.kudu.client">PartialRow</a>&nbsp;newPartialRow()</pre>
<div class="block">Creates a new partial row for the schema.</div>
<dl>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a new partial row</dd>
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