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KSQL-378: content-based routing #333

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Oct 3, 2017
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KSQL-378: content-based routing #333

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30 changes: 30 additions & 0 deletions docs/examples.md
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Expand Up @@ -129,6 +129,36 @@ CREATE STREAM pageviews_transformed \
PARTITION BY userid;
```

Use a `[ WHERE condition ]` clause to select a subset of data. If you want to route streams with different criteria to different streams backed by different underlying Kafka topics, e.g. content-based routing, write multiple KSQL statements as follows:

```sql
CREATE STREAM pageviews_transformed_priority_1 \
WITH (timestamp='viewtime', \
partitions=5, \
value_format='JSON') AS \
SELECT viewtime, \
userid, \
pageid, \
TIMESTAMPTOSTRING(viewtime, 'yyyy-MM-dd HH:mm:ss.SSS') AS timestring \
FROM pageviews \
WHERE userid='User_1' OR userid='User_2' \
PARTITION BY userid;
```

```sql
CREATE STREAM pageviews_transformed_priority_2 \
WITH (timestamp='viewtime', \
partitions=5, \
value_format='JSON') AS \
SELECT viewtime, \
userid, \
pageid, \
TIMESTAMPTOSTRING(viewtime, 'yyyy-MM-dd HH:mm:ss.SSS') AS timestring \
FROM pageviews \
WHERE userid<>'User_1' AND userid<>'User_2' \
PARTITION BY userid;
```


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