Querying Pinot

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release-0.10.0

Querying Pinot

Learn how to query Pinot using SQL

SQL Dialect
Pinot uses the Calcite SQL parser to parse queries and uses MYSQL_ANSI dialect. You can see the grammar in the Calcite documentation.
Limitations
Pinot does not support joins or nested subqueries. We recommend using Presto for queries that span multiple tables. For more information, see Engineering Full SQL support for Pinot at Uber.
There is no DDL support. Tables can be created via the REST API.
Identifier vs Literal
In Pinot SQL:
Double quotes(") are used to force string identifiers, e.g. column names
Single quotes(') are used to enclose string literals. If the string literal also contains a single quote, escape this with a single quote e.g '''Pinot''' to match the string literal 'Pinot'
Mis-using those might cause unexpected query results:
e.g.
WHERE a='b' means the predicate on the column a equals to a string literal value 'b'
WHERE a="b" means the predicate on the column a equals to the value of the column b
If your column names use reserved keywords (e.g. timestamp or date) or special charactesr, you will need to use double quotes when referring to them in queries.
Example Queries
Selection
//default to limit 10
SELECT * 
FROM myTable 
​
SELECT * 
FROM myTable 
LIMIT 100
SELECT "date", "timestamp"
FROM myTable 
Aggregation
SELECT COUNT(*), MAX(foo), SUM(bar) 
FROM myTable
Grouping on Aggregation
SELECT MIN(foo), MAX(foo), SUM(foo), AVG(foo), bar, baz 
FROM myTable
GROUP BY bar, baz 
LIMIT 50
Ordering on Aggregation
SELECT MIN(foo), MAX(foo), SUM(foo), AVG(foo), bar, baz 
FROM myTable
GROUP BY bar, baz 
ORDER BY bar, MAX(foo) DESC 
LIMIT 50
Filtering
SELECT COUNT(*) 
FROM myTable
  WHERE foo = 'foo'
  AND bar BETWEEN 1 AND 20
  OR (baz < 42 AND quux IN ('hello', 'goodbye') AND quuux NOT IN (42, 69))
For performant filtering of ids in a list, see Filtering with IdSet.
Filtering with NULL predicate
SELECT COUNT(*) 
FROM myTable
  WHERE foo IS NOT NULL
  AND foo = 'foo'
  AND bar BETWEEN 1 AND 20
  OR (baz < 42 AND quux IN ('hello', 'goodbye') AND quuux NOT IN (42, 69))
Selection (Projection)
SELECT * 
FROM myTable
  WHERE quux < 5
  LIMIT 50
Ordering on Selection
SELECT foo, bar 
FROM myTable
  WHERE baz > 20
  ORDER BY bar DESC
  LIMIT 100
Pagination on Selection
Results might not be consistent if the order by column has the same value in multiple rows.
SELECT foo, bar 
FROM myTable
  WHERE baz > 20
  ORDER BY bar DESC
  LIMIT 50, 100
Wild-card match (in WHERE clause only)
To count rows where the column airlineName starts with U
SELECT COUNT(*) 
FROM myTable
  WHERE REGEXP_LIKE(airlineName, '^U.*')
  GROUP BY airlineName LIMIT 10
Case-When Statement
Pinot supports the CASE-WHEN-ELSE statement.
Example 1:
SELECT
    CASE
      WHEN price > 30 THEN 3
      WHEN price > 20 THEN 2
      WHEN price > 10 THEN 1
      ELSE 0
    END AS price_category
FROM myTable
Example 2:
SELECT
  SUM(
    CASE
      WHEN price > 30 THEN 30
      WHEN price > 20 THEN 20
      WHEN price > 10 THEN 10
      ELSE 0
    END) AS total_cost
FROM myTable
UDF
Functions have to be implemented within Pinot. Injecting functions is not yet supported. The example below demonstrate the use of UDFs.
SELECT COUNT(*)
FROM myTable
GROUP BY DATETIMECONVERT(timeColumnName, '1:MILLISECONDS:EPOCH', '1:HOURS:EPOCH', '1:HOURS')
For more examples, see Transform Function in Aggregation Grouping.
BYTES column
Pinot supports queries on BYTES column using HEX string. The query response also uses HEX string to represent bytes values.
e.g. the query below fetches all the rows for a given UID.
SELECT * 
FROM myTable
WHERE UID = 'c8b3bce0b378fc5ce8067fc271a34892'