cancel
Showing results for 
Search instead for 
Did you mean: 
Data Engineering
Join discussions on data engineering best practices, architectures, and optimization strategies within the Databricks Community. Exchange insights and solutions with fellow data engineers.
cancel
Showing results for 
Search instead for 
Did you mean: 

How many columns does Delta Engine collect stats on for a Delta Table

aladda
Honored Contributor II
Honored Contributor II
 
1 ACCEPTED SOLUTION

Accepted Solutions

aladda
Honored Contributor II
Honored Contributor II

by default a delta table has stats collected on the first 32 columns. This setting can be configured using the following.

set spark.databricks.delta.properties.defaults.dataSkippingNumIndexedCols = 3

However there's a time trade-off to having a large number of columns set for stats collection. You typically want to collect stats on column that are used in filter, where clauses joins and on which you tend to performance aggregations.

View solution in original post

1 REPLY 1

aladda
Honored Contributor II
Honored Contributor II

by default a delta table has stats collected on the first 32 columns. This setting can be configured using the following.

set spark.databricks.delta.properties.defaults.dataSkippingNumIndexedCols = 3

However there's a time trade-off to having a large number of columns set for stats collection. You typically want to collect stats on column that are used in filter, where clauses joins and on which you tend to performance aggregations.

Join 100K+ Data Experts: Register Now & Grow with Us!

Excited to expand your horizons with us? Click here to Register and begin your journey to success!

Already a member? Login and join your local regional user group! If there isn’t one near you, fill out this form and we’ll create one for you to join!