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<h2 title="Interface SchemaRelationProvider" class="title">Interface SchemaRelationProvider</h2>
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<pre>public interface <span class="strong">SchemaRelationProvider</span></pre>
<div class="block">::DeveloperApi::
Implemented by objects that produce relations for a specific kind of data source
with a given schema. When Spark SQL is given a DDL operation with a USING clause specified (
to specify the implemented SchemaRelationProvider) and a user defined schema, this interface
is used to pass in the parameters specified by a user.
<p>
Users may specify the fully qualified class name of a given data source. When that class is
not found Spark SQL will append the class name <code>DefaultSource</code> to the path, allowing for
less verbose invocation. For example, 'org.apache.spark.sql.json' would resolve to the
data source 'org.apache.spark.sql.json.DefaultSource'
<p>
A new instance of this class with be instantiated each time a DDL call is made.
<p>
The difference between a <a href="../../../../../org/apache/spark/sql/sources/RelationProvider.html" title="interface in org.apache.spark.sql.sources"><code>RelationProvider</code></a> and a <a href="../../../../../org/apache/spark/sql/sources/SchemaRelationProvider.html" title="interface in org.apache.spark.sql.sources"><code>SchemaRelationProvider</code></a> is that
users need to provide a schema when using a <a href="../../../../../org/apache/spark/sql/sources/SchemaRelationProvider.html" title="interface in org.apache.spark.sql.sources"><code>SchemaRelationProvider</code></a>.
A relation provider can inherits both <a href="../../../../../org/apache/spark/sql/sources/RelationProvider.html" title="interface in org.apache.spark.sql.sources"><code>RelationProvider</code></a> and <a href="../../../../../org/apache/spark/sql/sources/SchemaRelationProvider.html" title="interface in org.apache.spark.sql.sources"><code>SchemaRelationProvider</code></a>
if it can support both schema inference and user-specified schemas.
<p></div>
<dl><dt><span class="strong">Since:</span></dt>
<dd>1.3.0</dd></dl>
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<td class="colFirst"><code><a href="../../../../../org/apache/spark/sql/sources/BaseRelation.html" title="class in org.apache.spark.sql.sources">BaseRelation</a></code></td>
<td class="colLast"><code><strong><a href="../../../../../org/apache/spark/sql/sources/SchemaRelationProvider.html#createRelation(org.apache.spark.sql.SQLContext, scala.collection.immutable.Map, org.apache.spark.sql.types.StructType)">createRelation</a></strong>(<a href="../../../../../org/apache/spark/sql/SQLContext.html" title="class in org.apache.spark.sql">SQLContext</a> sqlContext,
scala.collection.immutable.Map<java.lang.String,java.lang.String> parameters,
<a href="../../../../../org/apache/spark/sql/types/StructType.html" title="class in org.apache.spark.sql.types">StructType</a> schema)</code>
<div class="block">Returns a new base relation with the given parameters and user defined schema.</div>
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<h4>createRelation</h4>
<pre><a href="../../../../../org/apache/spark/sql/sources/BaseRelation.html" title="class in org.apache.spark.sql.sources">BaseRelation</a> createRelation(<a href="../../../../../org/apache/spark/sql/SQLContext.html" title="class in org.apache.spark.sql">SQLContext</a> sqlContext,
scala.collection.immutable.Map<java.lang.String,java.lang.String> parameters,
<a href="../../../../../org/apache/spark/sql/types/StructType.html" title="class in org.apache.spark.sql.types">StructType</a> schema)</pre>
<div class="block">Returns a new base relation with the given parameters and user defined schema.
Note: the parameters' keywords are case insensitive and this insensitivity is enforced
by the Map that is passed to the function.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>sqlContext</code> - (undocumented)</dd><dd><code>parameters</code> - (undocumented)</dd><dd><code>schema</code> - (undocumented)</dd>
<dt><span class="strong">Returns:</span></dt><dd>(undocumented)</dd></dl>
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