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chore(QA,plugin): moving statistics code to prepare for PRIMARY KEY support in QA.

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This commit is contained in:
drrtuy
2025-10-07 21:56:46 +00:00
parent 47008a2a3f
commit fb98e46bfc
10 changed files with 100 additions and 78 deletions
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89
dbcon/mysql/ha_mcs_impl_if.h
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@@ -122,15 +122,12 @@ typedef std::tr1::unordered_map<TABLE_LIST*, uint> TableOuterJoinMap;
struct ColumnStatistics
{
ColumnStatistics(execplan::SimpleColumn column, std::vector<Histogram_json_hb*> histograms)
ColumnStatistics(execplan::SimpleColumn& column, std::vector<Histogram_json_hb*> histograms)
: column(column), histograms(histograms)
{
}
ColumnStatistics() = default;
execplan::SimpleColumn column;
std::vector<Histogram_json_hb*> histograms;
std::vector<Histogram_json_hb*>& getHistograms()
{
return histograms;
@@ -140,13 +137,82 @@ struct ColumnStatistics
{
return column;
}
execplan::SimpleColumn column;
std::vector<Histogram_json_hb*> histograms;
Field* min{nullptr};
Field* max{nullptr};
};
using ColumnName = std::string;
using MDBColumnStatistics = Column_statistics;
using ColumnStatisticsMap = std::unordered_map<ColumnName, ColumnStatistics>;
using TableStatisticsMap =
std::unordered_map<SchemaAndTableName, ColumnStatisticsMap, SchemaAndTableNameHash>;
struct TableStatistics
{
TableStatistics() = default;
void createOrUpdate(SchemaAndTableName tableName, const char* fieldName, execplan::SimpleColumn& sc,
MDBColumnStatistics* statistics)
{
auto* histogram = dynamic_cast<Histogram_json_hb*>(statistics->histogram);
auto tableStatisticsIt = tableStatistics_.find(tableName);
if (tableStatisticsIt == tableStatistics_.end())
{
tableStatistics_[tableName][fieldName] = {sc, {histogram}};
}
else
{
auto columnStatisticsMapIt = tableStatisticsIt->second.find(fieldName);
if (columnStatisticsMapIt == tableStatisticsIt->second.end())
{
tableStatisticsIt->second[fieldName] = {sc, {histogram}};
}
else
{
auto& columnStatisticsVec = columnStatisticsMapIt->second.getHistograms();
columnStatisticsVec.push_back(histogram);
}
}
}
std::optional<ColumnStatisticsMap> findStatisticsForATable(SchemaAndTableName& schemaAndTableName)
{
auto tableStatisticsIt = tableStatistics_.find(schemaAndTableName);
if (tableStatisticsIt == tableStatistics_.end())
{
return std::nullopt;
}
return {tableStatisticsIt->second};
}
void mergeTableStatistics(const TableStatistics& aTableStatistics)
{
for (auto& [schemaAndTableName, aColumnStatisticsMap] : aTableStatistics.tableStatistics_)
{
auto tableStatisticsIt = tableStatistics_.find(schemaAndTableName);
if (tableStatisticsIt == tableStatistics_.end())
{
tableStatistics_[schemaAndTableName] = aColumnStatisticsMap;
}
else
{
for (auto& [columnName, histogram] : aColumnStatisticsMap)
{
tableStatisticsIt->second[columnName] = histogram;
}
}
}
}
TableStatisticsMap tableStatistics_;
};
// This structure is used to store MDB AST -> CSEP translation context.
// There is a column statistics for some columns in a query.
// As per 23.10.5 "some" means first column of the index in projection list of CSEP
@@ -161,7 +227,7 @@ struct gp_walk_info
execplan::CalpontSelectExecutionPlan::ReturnedColumnList orderByCols;
std::vector<Item*> extSelAggColsItems;
execplan::CalpontSelectExecutionPlan::ColumnMap columnMap;
TableStatisticsMap tableStatisticsMap;
TableStatistics tableStatistics;
// This vector temporarily hold the projection columns to be added
// to the returnedCols vector for subquery processing. It will be appended
// to the end of returnedCols when the processing is finished.
@@ -252,7 +318,7 @@ struct gp_walk_info
SubQuery** subQueriesChain;
gp_walk_info(long timeZone_, SubQuery** subQueriesChain_)
: tableStatisticsMap({})
: tableStatistics({})
, sessionid(0)
, fatalParseError(false)
, condPush(false)
@@ -284,17 +350,10 @@ struct gp_walk_info
}
~gp_walk_info();
void mergeTableStatistics(const TableStatisticsMap& tableStatisticsMap);
void mergeTableStatistics(const TableStatistics& tableStatistics);
std::optional<ColumnStatisticsMap> findStatisticsForATable(SchemaAndTableName& schemaAndTableName)
{
auto tableStatisticsMapIt = tableStatisticsMap.find(schemaAndTableName);
if (tableStatisticsMapIt == tableStatisticsMap.end())
{
return std::nullopt;
}
return {tableStatisticsMapIt->second};
return tableStatistics.findStatisticsForATable(schemaAndTableName);
}
};