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| <li>概要: </li> |
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| <div class="subTitle">org.apache.calcite.schema</div> |
| <h2 title="接口 Schema" class="title">接口 Schema</h2> |
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| <dl> |
| <dt>所有已知子接口:</dt> |
| <dd><a href="../../../../org/apache/calcite/schema/SchemaPlus.html" title="org.apache.calcite.schema中的接口">SchemaPlus</a>, <a href="../../../../org/apache/calcite/schema/SemiMutableSchema.html" title="org.apache.calcite.schema中的接口">SemiMutableSchema</a></dd> |
| </dl> |
| <dl> |
| <dt>所有已知实现类:</dt> |
| <dd><a href="../../../../org/apache/calcite/schema/impl/AbstractSchema.html" title="org.apache.calcite.schema.impl中的类">AbstractSchema</a>, <a href="../../../../org/apache/calcite/adapter/cassandra/CassandraSchema.html" title="org.apache.calcite.adapter.cassandra中的类">CassandraSchema</a>, <a href="../../../../org/apache/calcite/adapter/clone/CloneSchema.html" title="org.apache.calcite.adapter.clone中的类">CloneSchema</a>, <a href="../../../../org/apache/calcite/adapter/csv/CsvSchema.html" title="org.apache.calcite.adapter.csv中的类">CsvSchema</a>, <a href="../../../../org/apache/calcite/schema/impl/DelegatingSchema.html" title="org.apache.calcite.schema.impl中的类">DelegatingSchema</a>, <a href="../../../../org/apache/calcite/adapter/druid/DruidSchema.html" title="org.apache.calcite.adapter.druid中的类">DruidSchema</a>, <a href="../../../../org/apache/calcite/adapter/elasticsearch/ElasticsearchSchema.html" title="org.apache.calcite.adapter.elasticsearch中的类">ElasticsearchSchema</a>, <a href="../../../../org/apache/calcite/adapter/geode/rel/GeodeSchema.html" title="org.apache.calcite.adapter.geode.rel中的类">GeodeSchema</a>, <a href="../../../../org/apache/calcite/adapter/geode/simple/GeodeSimpleSchema.html" title="org.apache.calcite.adapter.geode.simple中的类">GeodeSimpleSchema</a>, <a href="../../../../org/apache/calcite/adapter/jdbc/JdbcCatalogSchema.html" title="org.apache.calcite.adapter.jdbc中的类">JdbcCatalogSchema</a>, <a href="../../../../org/apache/calcite/adapter/jdbc/JdbcSchema.html" title="org.apache.calcite.adapter.jdbc中的类">JdbcSchema</a>, <a href="../../../../org/apache/calcite/adapter/mongodb/MongoSchema.html" title="org.apache.calcite.adapter.mongodb中的类">MongoSchema</a>, <a href="../../../../org/apache/calcite/adapter/pig/PigSchema.html" title="org.apache.calcite.adapter.pig中的类">PigSchema</a>, <a href="../../../../org/apache/calcite/adapter/java/ReflectiveSchema.html" title="org.apache.calcite.adapter.java中的类">ReflectiveSchema</a>, <a href="../../../../org/apache/calcite/adapter/splunk/SplunkSchema.html" title="org.apache.calcite.adapter.splunk中的类">SplunkSchema</a>, <a href="../../../../org/apache/calcite/adapter/tpcds/TpcdsSchema.html" title="org.apache.calcite.adapter.tpcds中的类">TpcdsSchema</a>, <a href="../../../../org/apache/calcite/adapter/tpch/TpchSchema.html" title="org.apache.calcite.adapter.tpch中的类">TpchSchema</a></dd> |
| </dl> |
| <hr> |
| <br> |
| <pre>public interface <span class="typeNameLabel">Schema</span></pre> |
| <div class="block">A namespace for tables and functions. |
| |
| <p>A schema can also contain sub-schemas, to any level of nesting. Most |
| providers have a limited number of levels; for example, most JDBC databases |
| have either one level ("schemas") or two levels ("database" and |
| "catalog").</p> |
| |
| <p>There may be multiple overloaded functions with the same name but |
| different numbers or types of parameters. |
| For this reason, <a href="../../../../org/apache/calcite/schema/Schema.html#getFunctions-java.lang.String-"><code>getFunctions(java.lang.String)</code></a> returns a list of all |
| members with the same name. Calcite will call |
| <a href="../../../../org/apache/calcite/schema/Schemas.html#resolve-org.apache.calcite.rel.type.RelDataTypeFactory-java.lang.String-java.util.Collection-java.util.List-"><code>Schemas.resolve(org.apache.calcite.rel.type.RelDataTypeFactory, String, java.util.Collection, java.util.List)</code></a> |
| to choose the appropriate one.</p> |
| |
| <p>The most common and important type of member is the one with no |
| arguments and a result type that is a collection of records. This is called a |
| <dfn>relation</dfn>. It is equivalent to a table in a relational |
| database.</p> |
| |
| <p>For example, the query</p> |
| |
| <blockquote>select * from sales.emps</blockquote> |
| |
| <p>is valid if "sales" is a registered |
| schema and "emps" is a member with zero parameters and a result type |
| of <code>Collection(Record(int: "empno", String: "name"))</code>.</p> |
| |
| <p>A schema may be nested within another schema; see |
| <a href="../../../../org/apache/calcite/schema/Schema.html#getSubSchema-java.lang.String-"><code>getSubSchema(String)</code></a>.</p></div> |
| </li> |
| </ul> |
| </div> |
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| <!-- ======== NESTED CLASS SUMMARY ======== --> |
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| <li class="blockList"><a name="nested.class.summary"> |
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| </a> |
| <h3>嵌套类概要</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="嵌套类概要表, 列表嵌套类和解释"> |
| <caption><span>嵌套类</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">限定符和类型</th> |
| <th class="colLast" scope="col">接口和说明</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>static class </code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Schema.TableType.html" title="org.apache.calcite.schema中的枚举">Schema.TableType</a></span></code> |
| <div class="block">Table type.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| <!-- ========== METHOD SUMMARY =========== --> |
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| <h3>方法概要</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="方法概要表, 列表方法和解释"> |
| <caption><span id="t0" class="activeTableTab"><span>所有方法</span><span class="tabEnd"> </span></span><span id="t2" class="tableTab"><span><a href="javascript:show(2);">实例方法</a></span><span class="tabEnd"> </span></span><span id="t3" class="tableTab"><span><a href="javascript:show(4);">抽象方法</a></span><span class="tabEnd"> </span></span></caption> |
| <tr> |
| <th class="colFirst" scope="col">限定符和类型</th> |
| <th class="colLast" scope="col">方法和说明</th> |
| </tr> |
| <tr id="i0" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/calcite/linq4j/tree/Expression.html" title="org.apache.calcite.linq4j.tree中的类">Expression</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Schema.html#getExpression-org.apache.calcite.schema.SchemaPlus-java.lang.String-">getExpression</a></span>(<a href="../../../../org/apache/calcite/schema/SchemaPlus.html" title="org.apache.calcite.schema中的接口">SchemaPlus</a> parentSchema, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name)</code> |
| <div class="block">Returns the expression by which this schema can be referenced in generated |
| code.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="java.util中的类或接口">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Schema.html#getFunctionNames--">getFunctionNames</a></span>()</code> |
| <div class="block">Returns the names of the functions in this schema.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="java.util中的类或接口">Collection</a><<a href="../../../../org/apache/calcite/schema/Function.html" title="org.apache.calcite.schema中的接口">Function</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Schema.html#getFunctions-java.lang.String-">getFunctions</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name)</code> |
| <div class="block">Returns a list of functions in this schema with the given name, or |
| an empty list if there is no such function.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/calcite/schema/Schema.html" title="org.apache.calcite.schema中的接口">Schema</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Schema.html#getSubSchema-java.lang.String-">getSubSchema</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name)</code> |
| <div class="block">Returns a sub-schema with a given name, or null.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="java.util中的类或接口">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Schema.html#getSubSchemaNames--">getSubSchemaNames</a></span>()</code> |
| <div class="block">Returns the names of this schema's child schemas.</div> |
| </td> |
| </tr> |
| <tr id="i5" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/calcite/schema/Table.html" title="org.apache.calcite.schema中的接口">Table</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Schema.html#getTable-java.lang.String-">getTable</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name)</code> |
| <div class="block">Returns a table with a given name, or null if not found.</div> |
| </td> |
| </tr> |
| <tr id="i6" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="java.util中的类或接口">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Schema.html#getTableNames--">getTableNames</a></span>()</code> |
| <div class="block">Returns the names of the tables in this schema.</div> |
| </td> |
| </tr> |
| <tr id="i7" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口">RelProtoDataType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Schema.html#getType-java.lang.String-">getType</a></span>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name)</code> |
| <div class="block">Returns a type with a given name, or null if not found.</div> |
| </td> |
| </tr> |
| <tr id="i8" class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="java.util中的类或接口">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Schema.html#getTypeNames--">getTypeNames</a></span>()</code> |
| <div class="block">Returns the names of the types in this schema.</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/calcite/schema/Schema.html#isMutable--">isMutable</a></span>()</code> |
| <div class="block">Returns whether the user is allowed to create new tables, functions |
| and sub-schemas in this schema, in addition to those returned automatically |
| by methods such as <a href="../../../../org/apache/calcite/schema/Schema.html#getTable-java.lang.String-"><code>getTable(String)</code></a>.</div> |
| </td> |
| </tr> |
| <tr id="i10" class="altColor"> |
| <td class="colFirst"><code><a href="../../../../org/apache/calcite/schema/Schema.html" title="org.apache.calcite.schema中的接口">Schema</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/apache/calcite/schema/Schema.html#snapshot-org.apache.calcite.schema.SchemaVersion-">snapshot</a></span>(<a href="../../../../org/apache/calcite/schema/SchemaVersion.html" title="org.apache.calcite.schema中的接口">SchemaVersion</a> version)</code> |
| <div class="block">Returns the snapshot of this schema as of the specified time.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <div class="details"> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <!-- ============ METHOD DETAIL ========== --> |
| <ul class="blockList"> |
| <li class="blockList"><a name="method.detail"> |
| <!-- --> |
| </a> |
| <h3>方法详细资料</h3> |
| <a name="getTable-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getTable</h4> |
| <pre><a href="../../../../org/apache/calcite/schema/Table.html" title="org.apache.calcite.schema中的接口">Table</a> getTable(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name)</pre> |
| <div class="block">Returns a table with a given name, or null if not found.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>name</code> - Table name</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Table, or null</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getTableNames--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getTableNames</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="java.util中的类或接口">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>> getTableNames()</pre> |
| <div class="block">Returns the names of the tables in this schema.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Names of the tables in this schema</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getType-java.lang.String-"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>getType</h4> |
| <pre><a href="../../../../org/apache/calcite/rel/type/RelProtoDataType.html" title="org.apache.calcite.rel.type中的接口">RelProtoDataType</a> getType(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name)</pre> |
| <div class="block">Returns a type with a given name, or null if not found.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>name</code> - Table name</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Table, or null</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getTypeNames--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>getTypeNames</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="java.util中的类或接口">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>> getTypeNames()</pre> |
| <div class="block">Returns the names of the types in this schema.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Names of the tables in this schema</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getFunctions-java.lang.String-"> |
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| </a> |
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| <li class="blockList"> |
| <h4>getFunctions</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Collection.html?is-external=true" title="java.util中的类或接口">Collection</a><<a href="../../../../org/apache/calcite/schema/Function.html" title="org.apache.calcite.schema中的接口">Function</a>> getFunctions(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name)</pre> |
| <div class="block">Returns a list of functions in this schema with the given name, or |
| an empty list if there is no such function.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>name</code> - Name of function</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>List of functions with given name, or empty list</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getFunctionNames--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>getFunctionNames</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="java.util中的类或接口">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>> getFunctionNames()</pre> |
| <div class="block">Returns the names of the functions in this schema.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Names of the functions in this schema</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getSubSchema-java.lang.String-"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>getSubSchema</h4> |
| <pre><a href="../../../../org/apache/calcite/schema/Schema.html" title="org.apache.calcite.schema中的接口">Schema</a> getSubSchema(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name)</pre> |
| <div class="block">Returns a sub-schema with a given name, or null.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>name</code> - Sub-schema name</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Sub-schema with a given name, or null</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getSubSchemaNames--"> |
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| </a> |
| <ul class="blockList"> |
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| <h4>getSubSchemaNames</h4> |
| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/util/Set.html?is-external=true" title="java.util中的类或接口">Set</a><<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a>> getSubSchemaNames()</pre> |
| <div class="block">Returns the names of this schema's child schemas.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Names of this schema's child schemas</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="getExpression-org.apache.calcite.schema.SchemaPlus-java.lang.String-"> |
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| </a> |
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| <h4>getExpression</h4> |
| <pre><a href="../../../../org/apache/calcite/linq4j/tree/Expression.html" title="org.apache.calcite.linq4j.tree中的类">Expression</a> getExpression(<a href="../../../../org/apache/calcite/schema/SchemaPlus.html" title="org.apache.calcite.schema中的接口">SchemaPlus</a> parentSchema, |
| <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="java.lang中的类或接口">String</a> name)</pre> |
| <div class="block">Returns the expression by which this schema can be referenced in generated |
| code.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>parentSchema</code> - Parent schema</dd> |
| <dd><code>name</code> - Name of this schema</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Expression by which this schema can be referenced in generated code</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="isMutable--"> |
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| <h4>isMutable</h4> |
| <pre>boolean isMutable()</pre> |
| <div class="block">Returns whether the user is allowed to create new tables, functions |
| and sub-schemas in this schema, in addition to those returned automatically |
| by methods such as <a href="../../../../org/apache/calcite/schema/Schema.html#getTable-java.lang.String-"><code>getTable(String)</code></a>. |
| |
| <p>Even if this method returns true, the maps are not modified. Calcite |
| stores the defined objects in a wrapper object.</div> |
| <dl> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>Whether the user is allowed to create new tables, functions |
| and sub-schemas in this schema</dd> |
| </dl> |
| </li> |
| </ul> |
| <a name="snapshot-org.apache.calcite.schema.SchemaVersion-"> |
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| <h4>snapshot</h4> |
| <pre><a href="../../../../org/apache/calcite/schema/Schema.html" title="org.apache.calcite.schema中的接口">Schema</a> snapshot(<a href="../../../../org/apache/calcite/schema/SchemaVersion.html" title="org.apache.calcite.schema中的接口">SchemaVersion</a> version)</pre> |
| <div class="block">Returns the snapshot of this schema as of the specified time. The |
| contents of the schema snapshot should not change over time.</div> |
| <dl> |
| <dt><span class="paramLabel">参数:</span></dt> |
| <dd><code>version</code> - The current schema version</dd> |
| <dt><span class="returnLabel">返回:</span></dt> |
| <dd>the schema snapshot.</dd> |
| </dl> |
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