IteratorProfiler Class Reference

Profiling data for an iterator, needed by 'EXPLAIN ANALYZE'. More...

#include <row_iterator.h>

Inheritance diagram for IteratorProfiler:

Public Member Functions
virtual double	GetFirstRowMs () const =0
	Time (in ms) spent fetching the first row. More...
virtual double	GetLastRowMs () const =0
	Time (in ms) spent fetching the remaining rows. More...
virtual uint64_t	GetNumInitCalls () const =0
	The number of loops (i.e number of iterator->Init() calls. More...
virtual uint64_t	GetNumRows () const =0
	The number of rows fetched. More...
virtual	~IteratorProfiler ()=default

Detailed Description

Profiling data for an iterator, needed by 'EXPLAIN ANALYZE'.

Note that an iterator may be iterated over multiple times, e.g. if it is the inner operand of a neste loop join. This is denoted 'loops' below, and the metrics in this class are aggregated values for all loops.

Constructor & Destructor Documentation

~IteratorProfiler()

virtual IteratorProfiler::~IteratorProfiler ( )

virtualdefault

Member Function Documentation

GetFirstRowMs()

virtual double IteratorProfiler::GetFirstRowMs ( ) const

pure virtual

Time (in ms) spent fetching the first row.

(Sum for all loops.)

Implemented in DummyIteratorProfiler, and IteratorProfilerImpl.

GetLastRowMs()

virtual double IteratorProfiler::GetLastRowMs ( ) const

pure virtual

Time (in ms) spent fetching the remaining rows.

(Sum for all loops.)

Implemented in DummyIteratorProfiler, and IteratorProfilerImpl.

GetNumInitCalls()

virtual uint64_t IteratorProfiler::GetNumInitCalls ( ) const

pure virtual

The number of loops (i.e number of iterator->Init() calls.

Implemented in DummyIteratorProfiler, and IteratorProfilerImpl.

GetNumRows()

virtual uint64_t IteratorProfiler::GetNumRows ( ) const

pure virtual

The number of rows fetched.

(Sum for all loops.)

Implemented in DummyIteratorProfiler, and IteratorProfilerImpl.

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The documentation for this class was generated from the following file:

• sql/iterators/row_iterator.h