Details
Major Description
Created a Phoenix table with below schema:
CREATE TABLE IF NOT EXISTS sample_table ( id VARCHAR NOT NULL, metricid VARCHAR NOT NULL, timestamp TIMESTAMP NOT NULL, metricvalue DOUBLE, CONSTRAINT st_pk PRIMARY KEY(id,metricid,timestamp)) SALT_BUCKETS = 20;
Inserted some data into this and loaded as Spark Dataset using the Phoenix spark datasource ('org.apache.phoenix.spark') options.
The Spark Dataset's schema is as given below:
root
| – ID: string (nullable = true) |
| – METRICID: string (nullable = true) |
| – TIMESTAMP: timestamp (nullable = true) |
| – METRICVALUE: double (nullable = true) |
I apply the Dataset's filter operation on Timestamp column as given below:
Dataset<Row> ds = <Derived from Phoenix>
ds = ds.filter("TIMESTAMP >= CAST('2017-10-31 00:00:00.0' AS TIMESTAMP)")
This operation throws me an exception as:
testPhoenixTimestamp(DatasetTest): org.apache.phoenix.exception.PhoenixParserException: ERROR 604 (42P00): Syntax error. Mismatched input. Expecting "RPAREN", got "00" at line 1, column 145.
The generated query looks like this:
2017-11-02 15:29:31,722 INFO [main] org.apache.phoenix.mapreduce.PhoenixInputFormat Select Statement: SELECT "ID","METRICID","TIMESTAMP","0"."METRICVALUE" FROM SAMPLE_TABLE WHERE ( "TIMESTAMP" IS NOT NULL AND "TIMESTAMP" >= 2017-10-31 00:00:00.0)
The issue is with Timestamp filter condition, where the timestamp value is not wrapped in to_timestamp() function.
I have fixed this locally in org.apache.phoenix.spark.PhoenixRelation class compileValue() function, by checking the value's class. If it is java.sql.Timestamp then I am wrapping the value with to_timestamp() function.
Please let me know if there is another way of correctly querying Timestamp values in Phoenix through Spark's Dataset API.