histograms::HistogramSetting Struct Reference

A simple struct containing the settings for a histogram to be built. More...

#include <histogram.h>

Public Attributes
const char *	column_name
	A null-terminated C-style string with the name of the column to build the histogram for. More...
size_t	num_buckets = 100
	The target number of buckets for the histogram. More...
LEX_STRING	data = {nullptr, 0}
	Holds the JSON specification of the histogram for the UPDATE HISTOGRAM ... USING DATA command, otherwise empty. More...
bool	auto_update = false
	True if AUTO UPDATE, false for MANUAL UPDATE. More...
Field *	field = nullptr
	A pointer to the field, used internally by update_histograms(). More...

Detailed Description

A simple struct containing the settings for a histogram to be built.

Member Data Documentation

auto_update

bool histograms::HistogramSetting::auto_update = false

True if AUTO UPDATE, false for MANUAL UPDATE.

column_name

const char* histograms::HistogramSetting::column_name

A null-terminated C-style string with the name of the column to build the histogram for.

data

LEX_STRING histograms::HistogramSetting::data = {nullptr, 0}

Holds the JSON specification of the histogram for the UPDATE HISTOGRAM ... USING DATA command, otherwise empty.

field

Field* histograms::HistogramSetting::field = nullptr

A pointer to the field, used internally by update_histograms().

num_buckets

size_t histograms::HistogramSetting::num_buckets = 100

The target number of buckets for the histogram.

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

• sql/histograms/histogram.h