all: Initial provider defined functions implementation #1288
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Reference: hashicorp/terraform-plugin-go#351
Reference: https://developer.hashicorp.com/terraform/plugin/framework/migrating
The next versions of the plugin protocol (5.5/6.5) include support for provider defined functions. The terraform-plugin-sdk Go module will not be receiving this feature, however this Go module must be updated to handle the new RPCs with errors.
Provider developers can still implement provider defined functions in their terraform-plugin-sdk based providers by following the framework migration documentation to introduce terraform-plugin-mux, which then will enable terraform-plugin-framework based provider function implementations.