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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="strong">Schema</span> |
| extends <a href="http://docs.oracle.com/javase/7/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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| <tr> |
| <th class="colOne" scope="col">Constructor and Description</th> |
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| <tr class="altColor"> |
| <td class="colOne"><code><strong><a href="../../../org/apache/kudu/Schema.html#Schema(java.util.List)">Schema</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>> 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><strong><a href="../../../org/apache/kudu/Schema.html#Schema(java.util.List,%20java.util.List)">Schema</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>> columns, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> columnIds)</code> |
| <div class="block">Constructs a schema using the specified columns and IDs.</div> |
| </td> |
| </tr> |
| </table> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Method and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <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><strong><a href="../../../org/apache/kudu/Schema.html#getColumn(java.lang.String)">getColumn</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> columnName)</code> |
| <div class="block">Get the column associated with the specified name</div> |
| </td> |
| </tr> |
| <tr 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><strong><a href="../../../org/apache/kudu/Schema.html#getColumnByIndex(int)">getColumnByIndex</a></strong>(int idx)</code> |
| <div class="block">Get the column at the specified index in the original list</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/kudu/Schema.html#getColumnCount()">getColumnCount</a></strong>()</code> |
| <div class="block">Get the count of columns in this schema</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/kudu/Schema.html#getColumnIndex(int)">getColumnIndex</a></strong>(int columnId)</code> |
| <div class="block">Get the column index of the column with the provided ID.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/kudu/Schema.html#getColumnIndex(java.lang.String)">getColumnIndex</a></strong>(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> columnName)</code> |
| <div class="block">Get the index for the provided column name.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/kudu/Schema.html#getColumnOffset(int)">getColumnOffset</a></strong>(int idx)</code> |
| <div class="block">Get the index at which this column can be found in the backing byte array</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>></code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/kudu/Schema.html#getColumns()">getColumns</a></strong>()</code> |
| <div class="block">Get the list of columns used to create this schema</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/kudu/Schema.html#getPrimaryKeyColumnCount()">getPrimaryKeyColumnCount</a></strong>()</code> |
| <div class="block">Get the count of columns that are part of the primary key.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>></code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/kudu/Schema.html#getPrimaryKeyColumns()">getPrimaryKeyColumns</a></strong>()</code> |
| <div class="block">Get the primary key columns.</div> |
| </td> |
| </tr> |
| <tr 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><strong><a href="../../../org/apache/kudu/Schema.html#getRowKeyProjection()">getRowKeyProjection</a></strong>()</code> |
| <div class="block">Get a schema that only contains the columns which are part of the key</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/kudu/Schema.html#getRowSize()">getRowSize</a></strong>()</code> |
| <div class="block">Get the size a row built using this schema would be</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/kudu/Schema.html#getVarLengthColumnCount()">getVarLengthColumnCount</a></strong>()</code> |
| <div class="block">Get the count of columns with variable length (BINARY/STRING) in |
| this schema.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/kudu/Schema.html#hasColumnIds()">hasColumnIds</a></strong>()</code> |
| <div class="block">Tells whether this schema includes IDs for columns.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><strong><a href="../../../org/apache/kudu/Schema.html#hasNullableColumns()">hasNullableColumns</a></strong>()</code> |
| <div class="block">Tells if there's at least one nullable column</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <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><strong><a href="../../../org/apache/kudu/Schema.html#newPartialRow()">newPartialRow</a></strong>()</code> |
| <div class="block">Creates a new partial row for the schema.</div> |
| </td> |
| </tr> |
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| <h3>Methods inherited from class java.lang.<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a></h3> |
| <code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Object.html?is-external=true#wait(long,%20int)" title="class or interface in java.lang">wait</a></code></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
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| <h3>Constructor Detail</h3> |
| <a name="Schema(java.util.List)"> |
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| <h4>Schema</h4> |
| <pre>public Schema(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>> columns)</pre> |
| <div class="block">Constructs a schema using the specified columns and does some internal accounting</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>columns</code> - the columns in index order</dd> |
| <dt><span class="strong">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - If the key columns aren't specified first |
| |
| See <code>ColumnPBsToSchema()</code> in <code>src/kudu/common/wire_protocol.cc</code></dd></dl> |
| </li> |
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| <h4>Schema</h4> |
| <pre>public Schema(<a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>> columns, |
| <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html?is-external=true" title="class or interface in java.lang">Integer</a>> 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="strong">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="strong">Throws:</span></dt> |
| <dd><code><a href="http://docs.oracle.com/javase/7/docs/api/java/lang/IllegalArgumentException.html?is-external=true" title="class or interface in java.lang">IllegalArgumentException</a></code> - If the primary key columns aren't specified first</dd> |
| <dd><code><a href="http://docs.oracle.com/javase/7/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></dl> |
| </li> |
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| <h3>Method Detail</h3> |
| <a name="getColumns()"> |
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| </a> |
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| <li class="blockList"> |
| <h4>getColumns</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>> getColumns()</pre> |
| <div class="block">Get the list of columns used to create this schema</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>list of columns</dd></dl> |
| </li> |
| </ul> |
| <a name="getVarLengthColumnCount()"> |
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| <h4>getVarLengthColumnCount</h4> |
| <pre>public int getVarLengthColumnCount()</pre> |
| <div class="block">Get the count of columns with variable length (BINARY/STRING) in |
| this schema.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>strings count</dd></dl> |
| </li> |
| </ul> |
| <a name="getRowSize()"> |
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| </a> |
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| <h4>getRowSize</h4> |
| <pre>public int getRowSize()</pre> |
| <div class="block">Get the size a row built using this schema would be</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>size in bytes</dd></dl> |
| </li> |
| </ul> |
| <a name="getColumnOffset(int)"> |
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| </a> |
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| <h4>getColumnOffset</h4> |
| <pre>public int getColumnOffset(int 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="strong">Parameters:</span></dt><dd><code>idx</code> - column's index</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>column's offset</dd></dl> |
| </li> |
| </ul> |
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| <h4>getColumnIndex</h4> |
| <pre>public int getColumnIndex(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> columnName)</pre> |
| <div class="block">Get the index for the provided column name.</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>columnName</code> - column to search for</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>an index in the schema</dd></dl> |
| </li> |
| </ul> |
| <a name="getColumnByIndex(int)"> |
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| <h4>getColumnByIndex</h4> |
| <pre>public <a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a> getColumnByIndex(int idx)</pre> |
| <div class="block">Get the column at the specified index in the original list</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>idx</code> - column's index</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the column</dd></dl> |
| </li> |
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| <h4>getColumnIndex</h4> |
| <pre>public int getColumnIndex(int 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="strong">Parameters:</span></dt><dd><code>columnId</code> - the column id of the column</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the column index of the column.</dd></dl> |
| </li> |
| </ul> |
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| <h4>getColumn</h4> |
| <pre>public <a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a> getColumn(<a href="http://docs.oracle.com/javase/7/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> columnName)</pre> |
| <div class="block">Get the column associated with the specified name</div> |
| <dl><dt><span class="strong">Parameters:</span></dt><dd><code>columnName</code> - column's name</dd> |
| <dt><span class="strong">Returns:</span></dt><dd>the column</dd></dl> |
| </li> |
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| <h4>getColumnCount</h4> |
| <pre>public int getColumnCount()</pre> |
| <div class="block">Get the count of columns in this schema</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>count of columns</dd></dl> |
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| <h4>getPrimaryKeyColumnCount</h4> |
| <pre>public int getPrimaryKeyColumnCount()</pre> |
| <div class="block">Get the count of columns that are part of the primary key.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>count of primary key columns.</dd></dl> |
| </li> |
| </ul> |
| <a name="getPrimaryKeyColumns()"> |
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| <h4>getPrimaryKeyColumns</h4> |
| <pre>public <a href="http://docs.oracle.com/javase/7/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../org/apache/kudu/ColumnSchema.html" title="class in org.apache.kudu">ColumnSchema</a>> getPrimaryKeyColumns()</pre> |
| <div class="block">Get the primary key columns.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>the primary key columns.</dd></dl> |
| </li> |
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| <a name="getRowKeyProjection()"> |
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| <h4>getRowKeyProjection</h4> |
| <pre>public <a href="../../../org/apache/kudu/Schema.html" title="class in org.apache.kudu">Schema</a> getRowKeyProjection()</pre> |
| <div class="block">Get a schema that only contains the columns which are part of the key</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>new schema with only the keys</dd></dl> |
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| <h4>hasNullableColumns</h4> |
| <pre>public boolean hasNullableColumns()</pre> |
| <div class="block">Tells if there's at least one nullable column</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>true if at least one column is nullable, else false.</dd></dl> |
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| <h4>hasColumnIds</h4> |
| <pre>public boolean 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> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>whether this schema includes column IDs.</dd></dl> |
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| <pre>public <a href="../../../org/apache/kudu/client/PartialRow.html" title="class in org.apache.kudu.client">PartialRow</a> newPartialRow()</pre> |
| <div class="block">Creates a new partial row for the schema.</div> |
| <dl><dt><span class="strong">Returns:</span></dt><dd>a new partial row</dd></dl> |
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