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Databricks Virtual Schema Developer Guide

Initial Setup

Configure Databricks Credentials for Integration Tests

Create file test.properties with the following content, adapting the values for your test environment. Follow the user guide to get the credentials.

databricks.token = abcdefg1234567890hijklmopqrstuvwxyz1
databricks.host = https://abc-1234abcd-5678.cloud.databricks.com
databricks.storageRoot = s3://databricks-workspace-stack-123abc-bucket/unity-catalog/1234500000/
databricks.oauth.secret = abcdefg1234567890hijklmopqrstuvwxyz1
databricks.oauth.clientId = 123abc45-def7-89gh-1234-567890abcdef
databricks.oauth.servicePrincipalUuid = 321cba54-def7-89gh-1234-567890abcdef

Install Test and Build Dependencies

luarocks install --local busted
luarocks install --local ldoc
luarocks install --local --server=https://luarocks.org/dev luaformatter

Install Lua Type Definitions

Run the following script to download / update Lua type definitions for third party libraries. They will be stored in target/lua-type-definitions/.

./tools/fetch-lua-type-definitions.sh

VSCode

  1. Install recommended extensions (see .vscode/extensions.json)
  2. Configure busted using the Lua add-on manager to get type hints and documentation when writing Lua unit tests

Debug Logging for UDF

Class TestSetup automatically starts UdfLogCapturer listening on a local address. It configures the virtual schema with the correct DEBUG_ADDRESS and LOG_LEVEL and logs messages from the UDF with prefix Client #1>.

Run Lua Tests

The following script will run Lua tests and print test coverage:

# Run unit and integration tests
./tools/runtests.sh
# Run only unit tests
./tools/runtests.sh --run=utest

Format Lua Sources

./tools/format-lua.sh

Lua Type Checking

This project uses type annotations of the Lua Language Server. You should get type hints and warnings in your IDE.

You can run the type checker on the command line using

./tools/run-type-check.sh