Support database name and table name arguments to DeltaTable.isDeltaTable()

Feature request

Overview

Currently, DeltaTable.isDeltaTable() only supports table path. If you have a delta table registered in the metastore and if you execute DeltaTable.isDeltaTable("my_database.my_table"), it simply returns false.

The DeltaTable.forName() API already supports tableName argument in addition to the table path. This feature will bring parity and consistency to the isDeltaTable API.

def forName(sparkSession: SparkSession, tableName: String): [DeltaTable]
def forName(tableOrViewName: String): [DeltaTable]

Motivation

• Often end-users don't care about the underlying delta table path. Being able to check whether a given tableName is a delta table or not is incredibly valuable. Without this feature, they would have to run additional commands (e.g. desc extended) to get the table path first
• DeltaTable API Parity

Further details

Instead of end-users having to must reason about the delta table path, you could probably use spark.sessionState.catalog.getTableMetadata(tblIdentifier) api to get the table path and pass the table path to the existing isDeltaTable(). The tblIdentifier can be constructured using the user provided databaseName and tableName.

Willingness to contribute

The Delta Lake Community encourages new feature contributions. Would you or another member of your organization be willing to contribute an implementation of this feature?

• Yes. I can contribute this feature independently.