Amogh Margoor created SPARK-29059:
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Summary: Support for Hive Materialized Views for Spark SQL.
Key: SPARK-29059
URL: https://issues.apache.org/jira/browse/SPARK-29059
Project: Spark
Issue Type: Task
Components: Spark Core
Affects Versions: 3.0.0
Reporter: Amogh Margoor
Materialized view was introduced in Apache Hive 3.0.0. Currently, Spark
Catalyst does not optimize queries against Hive tables using Materialized View
the way Apache Calcite does it for Hive. This Jira is to add support for the
same.
We have developed it in our internal track would like to open source it. It
would consist of 3 major parts:
# Reading MV related Hive Metadata
# Implication Engine which would figure out if an expression exp1 implies
another expression exp2 i.e., if exp1 => exp2 is a tautology. This is similar
to RexImplication checker in Apache Calcite.
# Catalyst rule to replace tables by it's Materialized view using Implication
Engine. For e.g., if MV 'mv' has been created in Hive using query 'select *
from foo where x > 10 && x <110' then query 'select * from foo where x > 70
and x < 100' will be transformed into 'select * from mv where x >70 and x < 100'
Note that Implication Engine and Catalyst Rule is generic can be used even when
Spark decides to have it's own Materialized View.
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