What is Predicate Pushdown? Predicate Pushdown gets its name from the fact that portions of SQL statements, ones that filter data, are referred to as predicates. ... It can improve query performance by reducing the amount of data read (I/O) from Storage files.

What is predicate pushdown in spark?

A predicate push down filters the data in the database query, reducing the number of entries retrieved from the database and improving query performance. By default the Spark Dataset API will automatically push down valid WHERE clauses to the database.

How does predicate pushdown work?

The basic idea of predicate pushdown is that certain parts of SQL queries (the predicates) can be “pushed” to where the data lives. This optimization can drastically reduce query/processing time by filtering out data earlier rather than later.