[SPARK-19041][SS] Fix code snippet compilation issues in Structured Streaming Programming Guide

## What changes were proposed in this pull request?

Currently some code snippets in the programming guide just do not compile. We should fix them.

## How was this patch tested?

```
SKIP_API=1 jekyll build
```

## Screenshot from part of the change:

![snip20161231_37](https://cloud.githubusercontent.com/assets/15843379/21576864/cc52fcd8-cf7b-11e6-8bd6-f935d9ff4a6b.png)

Author: Liwei Lin <[email protected]>

Closes #16442 from lw-lin/ss-pro-guide-.

Author: lw-lin

docs/structured-streaming-programming-guide.md

@@ -537,21 +537,21 @@ Most of the common operations on DataFrame/Dataset are supported for streaming.
 <div data-lang="scala"  markdown="1">
 
 {% highlight scala %}
-case class DeviceData(device: String, type: String, signal: Double, time: DateTime)
+case class DeviceData(device: String, deviceType: String, signal: Double, time: DateTime)
 
-val df: DataFrame = ... // streaming DataFrame with IOT device data with schema { device: string, type: string, signal: double, time: string }
+val df: DataFrame = ... // streaming DataFrame with IOT device data with schema { device: string, deviceType: string, signal: double, time: string }
 val ds: Dataset[DeviceData] = df.as[DeviceData]    // streaming Dataset with IOT device data
 
 // Select the devices which have signal more than 10
 df.select("device").where("signal > 10")      // using untyped APIs   
 ds.filter(_.signal > 10).map(_.device)         // using typed APIs
 
 // Running count of the number of updates for each device type
-df.groupBy("type").count()                          // using untyped API
+df.groupBy("deviceType").count()                          // using untyped API
 
 // Running average signal for each device type
-import org.apache.spark.sql.expressions.scalalang.typed._
-ds.groupByKey(_.type).agg(typed.avg(_.signal))    // using typed API
+import org.apache.spark.sql.expressions.scalalang.typed
+ds.groupByKey(_.deviceType).agg(typed.avg(_.signal))    // using typed API
 {% endhighlight %}
 
 </div>
@@ -565,7 +565,7 @@ import org.apache.spark.sql.catalyst.encoders.ExpressionEncoder;
 
 public class DeviceData {
   private String device;
-  private String type;
+  private String deviceType;
   private Double signal;
   private java.sql.Date time;
   ...
@@ -590,13 +590,13 @@ ds.filter(new FilterFunction<DeviceData>() { // using typed APIs
 }, Encoders.STRING());
 
 // Running count of the number of updates for each device type
-df.groupBy("type").count(); // using untyped API
+df.groupBy("deviceType").count(); // using untyped API
 
 // Running average signal for each device type
 ds.groupByKey(new MapFunction<DeviceData, String>() { // using typed API
   @Override
   public String call(DeviceData value) throws Exception {
-    return value.getType();
+    return value.getDeviceType();
   }
 }, Encoders.STRING()).agg(typed.avg(new MapFunction<DeviceData, Double>() {
   @Override
@@ -611,13 +611,13 @@ ds.groupByKey(new MapFunction<DeviceData, String>() { // using typed API
 <div data-lang="python"  markdown="1">
 
 {% highlight python %}
-df = ...  # streaming DataFrame with IOT device data with schema { device: string, type: string, signal: double, time: DateType }
+df = ...  # streaming DataFrame with IOT device data with schema { device: string, deviceType: string, signal: double, time: DateType }
 
 # Select the devices which have signal more than 10
 df.select("device").where("signal > 10")                              
 
 # Running count of the number of updates for each device type
-df.groupBy("type").count()
+df.groupBy("deviceType").count()
 {% endhighlight %}
 </div>
 </div>
@@ -973,7 +973,7 @@ Here is a table of all the sinks, and the corresponding settings.
   <tr>
     <td><b>File Sink</b></td>
     <td>Append</td>
-    <td><pre>writeStream<br/>  .format("parquet")<br/>  .start()</pre></td>
+    <td><pre>writeStream<br/>  .format("parquet")<br/>  .option(<br/>    "checkpointLocation",<br/>    "path/to/checkpoint/dir")<br/>  .option(<br/>    "path",<br/>    "path/to/destination/dir")<br/>  .start()</pre></td>
     <td>Yes</td>
     <td>Supports writes to partitioned tables. Partitioning by time may be useful.</td>
   </tr>
@@ -1026,7 +1026,9 @@ noAggDF
 // Write new data to Parquet files
 noAggDF
   .writeStream
-  .parquet("path/to/destination/directory")
+  .format("parquet")
+  .option("checkpointLocation", "path/to/checkpoint/dir")
+  .option("path", "path/to/destination/dir")
   .start()
 
 // ========== DF with aggregation ==========
@@ -1066,7 +1068,9 @@ noAggDF
 // Write new data to Parquet files
 noAggDF
   .writeStream()
-  .parquet("path/to/destination/directory")
+  .format("parquet")
+  .option("checkpointLocation", "path/to/checkpoint/dir")
+  .option("path", "path/to/destination/dir")
   .start();
 
 // ========== DF with aggregation ==========
@@ -1106,7 +1110,9 @@ noAggDF \
 # Write new data to Parquet files
 noAggDF \
     .writeStream() \
-    .parquet("path/to/destination/directory") \
+    .format("parquet") \
+    .option("checkpointLocation", "path/to/checkpoint/dir") \
+    .option("path", "path/to/destination/dir") \
     .start()
 
 # ========== DF with aggregation ==========
@@ -1120,11 +1126,11 @@ aggDF \
     .start()
 
 # Have all the aggregates in an in memory table. The query name will be the table name
-aggDF\
-    .writeStream()\
-    .queryName("aggregates")\
-    .outputMode("complete")\
-    .format("memory")\
+aggDF \
+    .writeStream() \
+    .queryName("aggregates") \
+    .outputMode("complete") \
+    .format("memory") \
     .start()
 
 spark.sql("select * from aggregates").show()   # interactively query in-memory table
@@ -1159,7 +1165,9 @@ The `StreamingQuery` object created when a query is started can be used to monit
 {% highlight scala %}
 val query = df.writeStream.format("console").start()   // get the query object
 
-query.id          // get the unique identifier of the running query
+query.id          // get the unique identifier of the running query that persists across restarts from checkpoint data
+
+query.runId       // get the unique id of this run of the query, which will be generated at every start/restart
 
 query.name        // get the name of the auto-generated or user-specified name
 
@@ -1169,11 +1177,11 @@ query.stop()      // stop the query
 
 query.awaitTermination()   // block until query is terminated, with stop() or with error
 
-query.exception()    // the exception if the query has been terminated with error
+query.exception       // the exception if the query has been terminated with error
 
-query.sourceStatus()  // progress information about data has been read from the input sources
+query.recentProgress  // an array of the most recent progress updates for this query
 
-query.sinkStatus()   // progress information about data written to the output sink
+query.lastProgress    // the most recent progress update of this streaming query
 {% endhighlight %}
 
 
@@ -1183,21 +1191,23 @@ query.sinkStatus()   // progress information about data written to the output si
 {% highlight java %}
 StreamingQuery query = df.writeStream().format("console").start();   // get the query object
 
-query.id();          // get the unique identifier of the running query
+query.id();          // get the unique identifier of the running query that persists across restarts from checkpoint data
+
+query.runId();       // get the unique id of this run of the query, which will be generated at every start/restart
 
 query.name();        // get the name of the auto-generated or user-specified name
 
 query.explain();   // print detailed explanations of the query
 
-query.stop();      // stop the query 
+query.stop();      // stop the query
 
 query.awaitTermination();   // block until query is terminated, with stop() or with error
 
-query.exception();    // the exception if the query has been terminated with error
+query.exception();       // the exception if the query has been terminated with error
 
-query.sourceStatus();  // progress information about data has been read from the input sources
+query.recentProgress();  // an array of the most recent progress updates for this query
 
-query.sinkStatus();   // progress information about data written to the output sink
+query.lastProgress();    // the most recent progress update of this streaming query
 
 {% endhighlight %}
 
@@ -1207,7 +1217,9 @@ query.sinkStatus();   // progress information about data written to the output s
 {% highlight python %}
 query = df.writeStream().format("console").start()   # get the query object
 
-query.id()          # get the unique identifier of the running query
+query.id()          # get the unique identifier of the running query that persists across restarts from checkpoint data
+
+query.runId()       # get the unique id of this run of the query, which will be generated at every start/restart
 
 query.name()        # get the name of the auto-generated or user-specified name
 
@@ -1217,11 +1229,11 @@ query.stop()      # stop the query
 
 query.awaitTermination()   # block until query is terminated, with stop() or with error
 
-query.exception()    # the exception if the query has been terminated with error
+query.exception()       # the exception if the query has been terminated with error
 
-query.sourceStatus()  # progress information about data has been read from the input sources
+query.recentProgress()  # an array of the most recent progress updates for this query
 
-query.sinkStatus()   # progress information about data written to the output sink
+query.lastProgress()    # the most recent progress update of this streaming query
 
 {% endhighlight %}
 
@@ -1491,14 +1503,17 @@ spark.streams.addListener(new StreamingQueryListener() {
 {% highlight java %}
 SparkSession spark = ...
 
-spark.streams.addListener(new StreamingQueryListener() {
-    @Overrides void onQueryStarted(QueryStartedEvent queryStarted) {
+spark.streams().addListener(new StreamingQueryListener() {
+    @Override
+    public void onQueryStarted(QueryStartedEvent queryStarted) {
         System.out.println("Query started: " + queryStarted.id());
     }
-    @Overrides void onQueryTerminated(QueryTerminatedEvent queryTerminated) {
+    @Override
+    public void onQueryTerminated(QueryTerminatedEvent queryTerminated) {
         System.out.println("Query terminated: " + queryTerminated.id());
     }
-    @Overrides void onQueryProgress(QueryProgressEvent queryProgress) {
+    @Override
+    public void onQueryProgress(QueryProgressEvent queryProgress) {
         System.out.println("Query made progress: " + queryProgress.progress());
     }
 });