Catalog — Metastore Management Interface¶
Catalog is an abstraction of metadata catalogs for managing relational entities (e.g. database(s), tables, functions, table columns and temporary views).
Catalog is available using SparkSession.catalog property.
assert(spark.isInstanceOf[org.apache.spark.sql.SparkSession])
assert(spark.catalog.isInstanceOf[org.apache.spark.sql.catalog.Catalog])
Contract¶
cacheTable¶
cacheTable(
tableName: String): Unit
cacheTable(
tableName: String,
storageLevel: StorageLevel): Unit
Caches a given table
Used for SQL's CACHE TABLE and AlterTableRenameCommand command.