user-query-optimizer 0.1.1

## Introduction This API will help you optimize your sql queries for better performance.

## Workflow

### Create the optimizer object Object specific to a single (query, schema) pair e.g. optimizer = Optimizer(query, schema)

### Get optimization hints using optimize_query() Output: optimization hints

Usage: optimizer.optimize_query()

Initial Optimization Checks

• Using approximate algorithms (approx_distinct() instead of COUNT(DISTINCT …))

• Selecting the columns the user wants explicitly, rather than using (SELECT *)

• Filtering on partitioned columns

• Try to extract nested subqueries using a WITH clause.

Other Stuff

• Eliminate date_parse overhead

• Replace UNION with UNION ALL if duplicates do not need to be removed

• Aggregate a series of LIKE clauses into one regexp_like expression

• Push down a complex join condition into a sub query

• Specify GROUP BY targets with numbers for expressions

### Testing To run unit tests, run py.test (or py.test -s to see stdout) in the tests directory.