New creates a new Process.

NewFromProc create a new Process based on another process.

AnalyzeInfo analyze information for query.

Limitation specifies the maximum resources that can be used in one query.

Process contains context used in query execution one or more pipeline will be generated for one query, and one pipeline has one process instance.

Register used in execution pipeline and shared with all operators of the same pipeline.

RegisterMessage channel data Err == nil means pipeline finish with error Batch == nil means pipeline finish without error Batch != nil means pipeline is running.

SessionInfo session information.

StmtProfile will be clear for every statement.

WaitRegister channel.

Analyze analyzes information for operator.