Github user tedyu commented on a diff in the pull request:
https://github.com/apache/spark/pull/11006#discussion_r51652148
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/DataStreamReader.scala ---
@@ -0,0 +1,127 @@
+/*
+* Licensed to the Apache Software Foundation (ASF) under one or more
+* contributor license agreements. See the NOTICE file distributed with
+* this work for additional information regarding copyright ownership.
+* The ASF licenses this file to You under the Apache License, Version 2.0
+* (the "License"); you may not use this file except in compliance with
+* the License. You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+package org.apache.spark.sql
+
+import scala.collection.JavaConverters._
+
+import org.apache.spark.Logging
+import org.apache.spark.annotation.Experimental
+import org.apache.spark.sql.execution.datasources.ResolvedDataSource
+import org.apache.spark.sql.execution.streaming.StreamingRelation
+import org.apache.spark.sql.types.StructType
+
+/**
+ * :: Experimental ::
+ * An interface to reading streaming data. Use `sqlContext.streamFrom` to
access these methods.
+ *
+ * {{{
+ * val df = sqlContext.streamFrom
+ * .format("...")
+ * .open()
+ * }}}
+ */
+@Experimental
+class DataStreamReader private[sql](sqlContext: SQLContext) extends
Logging {
+
+ /**
+ * Specifies the input data source format.
+ *
+ * @since 2.0.0
+ */
+ def format(source: String): DataStreamReader = {
+ this.source = source
+ this
+ }
+
+ /**
+ * Specifies the input schema. Some data streams (e.g. JSON) can infer
the input schema
+ * automatically from data. By specifying the schema here, the
underlying data stream can
+ * skip the schema inference step, and thus speed up data reading.
+ *
+ * @since 2.0.0
+ */
+ def schema(schema: StructType): DataStreamReader = {
+ this.userSpecifiedSchema = Option(schema)
+ this
+ }
+
+ /**
+ * Adds an input option for the underlying data stream.
+ *
+ * @since 2.0.0
+ */
+ def option(key: String, value: String): DataStreamReader = {
--- End diff --
Should we add API which allows user to remove certain options ?
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