Close is a wrapper function on e.Close(), it handles some common codes.

NewBaseExecutor creates a new BaseExecutor instance.

NewBaseExecutorV2 creates a new BaseExecutorV2 instance.

NewFirstChunk creates a new chunk to buffer current executor's result.

NewIndexUsageReporter creates an index usage reporter util.

Next is a wrapper function on e.Next(), it handles some common codes.

Open is a wrapper function on e.Open(), it handles some common codes.

RetTypes returns all output column types.

TryNewCacheChunk tries to get a cached chunk.

BaseExecutor holds common information for executors.

BaseExecutorV2 is a simplified version of `BaseExecutor`, which doesn't contain a full session context.

IndexUsageReporter is a toolkit to report index usage.

Executor is the physical implementation of an algebra operator.