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column_stats_catalog.cpp
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//===----------------------------------------------------------------------===//
//
// Peloton
//
// column_stats_catalog.cpp
//
// Identification: src/catalog/column_stats_catalog.cpp
//
// Copyright (c) 2015-17, Carnegie Mellon University Database Group
//
//===----------------------------------------------------------------------===//
#include "catalog/column_stats_catalog.h"
#include "catalog/catalog.h"
#include "executor/logical_tile.h"
#include "optimizer/stats/column_stats_collector.h"
#include "storage/data_table.h"
#include "storage/tuple.h"
namespace peloton {
namespace catalog {
ColumnStatsCatalog *ColumnStatsCatalog::GetInstance(
concurrency::TransactionContext *txn) {
static ColumnStatsCatalog column_stats_catalog{txn};
return &column_stats_catalog;
}
ColumnStatsCatalog::ColumnStatsCatalog(concurrency::TransactionContext *txn)
: AbstractCatalog("CREATE TABLE " CATALOG_DATABASE_NAME
"." CATALOG_SCHEMA_NAME "." COLUMN_STATS_CATALOG_NAME
" ("
"database_id INT NOT NULL, "
"table_id INT NOT NULL, "
"column_id INT NOT NULL, "
"num_rows INT NOT NULL, "
"cardinality DECIMAL NOT NULL, "
"frac_null DECIMAL NOT NULL, "
"most_common_vals VARCHAR, "
"most_common_freqs VARCHAR, "
"histogram_bounds VARCHAR, "
"column_name VARCHAR, "
"has_index BOOLEAN,"
"PRIMARY KEY(database_id, table_id, column_id));",
txn) {
// non-unique key: (database_id, table_id)
Catalog::GetInstance()->CreateIndex(
CATALOG_DATABASE_NAME, CATALOG_SCHEMA_NAME, COLUMN_STATS_CATALOG_NAME,
{0, 1}, COLUMN_STATS_CATALOG_NAME "_skey1", false, IndexType::BWTREE,
txn);
}
ColumnStatsCatalog::~ColumnStatsCatalog() {}
bool ColumnStatsCatalog::InsertColumnStats(
oid_t database_id, oid_t table_id, oid_t column_id, int num_rows,
double cardinality, double frac_null, std::string most_common_vals,
std::string most_common_freqs, std::string histogram_bounds,
std::string column_name, bool has_index, type::AbstractPool *pool,
concurrency::TransactionContext *txn) {
std::unique_ptr<storage::Tuple> tuple(
new storage::Tuple(catalog_table_->GetSchema(), true));
auto val_db_id = type::ValueFactory::GetIntegerValue(database_id);
auto val_table_id = type::ValueFactory::GetIntegerValue(table_id);
auto val_column_id = type::ValueFactory::GetIntegerValue(column_id);
auto val_num_row = type::ValueFactory::GetIntegerValue(num_rows);
auto val_cardinality = type::ValueFactory::GetDecimalValue(cardinality);
auto val_frac_null = type::ValueFactory::GetDecimalValue(frac_null);
type::Value val_common_val, val_common_freq;
if (!most_common_vals.empty()) {
val_common_val = type::ValueFactory::GetVarcharValue(most_common_vals);
val_common_freq = type::ValueFactory::GetVarcharValue(most_common_freqs);
} else {
val_common_val =
type::ValueFactory::GetNullValueByType(type::TypeId::VARCHAR);
val_common_freq =
type::ValueFactory::GetNullValueByType(type::TypeId::DECIMAL);
}
type::Value val_hist_bounds;
if (!histogram_bounds.empty()) {
val_hist_bounds = type::ValueFactory::GetVarcharValue(histogram_bounds);
} else {
val_hist_bounds =
type::ValueFactory::GetNullValueByType(type::TypeId::VARCHAR);
}
type::Value val_column_name =
type::ValueFactory::GetVarcharValue(column_name);
type::Value val_has_index = type::ValueFactory::GetBooleanValue(has_index);
tuple->SetValue(ColumnId::DATABASE_ID, val_db_id, nullptr);
tuple->SetValue(ColumnId::TABLE_ID, val_table_id, nullptr);
tuple->SetValue(ColumnId::COLUMN_ID, val_column_id, nullptr);
tuple->SetValue(ColumnId::NUM_ROWS, val_num_row, nullptr);
tuple->SetValue(ColumnId::CARDINALITY, val_cardinality, nullptr);
tuple->SetValue(ColumnId::FRAC_NULL, val_frac_null, nullptr);
tuple->SetValue(ColumnId::MOST_COMMON_VALS, val_common_val, pool);
tuple->SetValue(ColumnId::MOST_COMMON_FREQS, val_common_freq, pool);
tuple->SetValue(ColumnId::HISTOGRAM_BOUNDS, val_hist_bounds, pool);
tuple->SetValue(ColumnId::COLUMN_NAME, val_column_name, pool);
tuple->SetValue(ColumnId::HAS_INDEX, val_has_index, nullptr);
// Insert the tuple into catalog table
return InsertTuple(std::move(tuple), txn);
}
bool ColumnStatsCatalog::DeleteColumnStats(
oid_t database_id, oid_t table_id, oid_t column_id,
concurrency::TransactionContext *txn) {
oid_t index_offset = IndexId::SECONDARY_KEY_0; // Secondary key index
std::vector<type::Value> values;
values.push_back(type::ValueFactory::GetIntegerValue(database_id).Copy());
values.push_back(type::ValueFactory::GetIntegerValue(table_id).Copy());
values.push_back(type::ValueFactory::GetIntegerValue(column_id).Copy());
return DeleteWithIndexScan(index_offset, values, txn);
}
std::unique_ptr<std::vector<type::Value>> ColumnStatsCatalog::GetColumnStats(
oid_t database_id, oid_t table_id, oid_t column_id,
concurrency::TransactionContext *txn) {
std::vector<oid_t> column_ids(
{ColumnId::NUM_ROWS, ColumnId::CARDINALITY, ColumnId::FRAC_NULL,
ColumnId::MOST_COMMON_VALS, ColumnId::MOST_COMMON_FREQS,
ColumnId::HISTOGRAM_BOUNDS, ColumnId::COLUMN_NAME, ColumnId::HAS_INDEX});
oid_t index_offset = IndexId::SECONDARY_KEY_0; // Secondary key index
std::vector<type::Value> values;
values.push_back(type::ValueFactory::GetIntegerValue(database_id).Copy());
values.push_back(type::ValueFactory::GetIntegerValue(table_id).Copy());
values.push_back(type::ValueFactory::GetIntegerValue(column_id).Copy());
auto result_tiles =
GetResultWithIndexScan(column_ids, index_offset, values, txn);
PELOTON_ASSERT(result_tiles->size() <= 1); // unique
if (result_tiles->size() == 0) {
return nullptr;
}
auto tile = (*result_tiles)[0].get();
PELOTON_ASSERT(tile->GetTupleCount() <= 1);
if (tile->GetTupleCount() == 0) {
return nullptr;
}
type::Value num_rows, cardinality, frac_null, most_common_vals,
most_common_freqs, hist_bounds, column_name, has_index;
num_rows = tile->GetValue(0, ColumnStatsOffset::NUM_ROWS_OFF);
cardinality = tile->GetValue(0, ColumnStatsOffset::CARDINALITY_OFF);
frac_null = tile->GetValue(0, ColumnStatsOffset::FRAC_NULL_OFF);
most_common_vals = tile->GetValue(0, ColumnStatsOffset::COMMON_VALS_OFF);
most_common_freqs = tile->GetValue(0, ColumnStatsOffset::COMMON_FREQS_OFF);
hist_bounds = tile->GetValue(0, ColumnStatsOffset::HIST_BOUNDS_OFF);
column_name = tile->GetValue(0, ColumnStatsOffset::COLUMN_NAME_OFF);
has_index = tile->GetValue(0, ColumnStatsOffset::HAS_INDEX_OFF);
std::unique_ptr<std::vector<type::Value>> column_stats(
new std::vector<type::Value>({num_rows, cardinality, frac_null,
most_common_vals, most_common_freqs,
hist_bounds, column_name, has_index}));
return column_stats;
}
// Return value: number of column stats
size_t ColumnStatsCatalog::GetTableStats(
oid_t database_id, oid_t table_id, concurrency::TransactionContext *txn,
std::map<oid_t, std::unique_ptr<std::vector<type::Value>>>
&column_stats_map) {
std::vector<oid_t> column_ids(
{ColumnId::COLUMN_ID, ColumnId::NUM_ROWS, ColumnId::CARDINALITY,
ColumnId::FRAC_NULL, ColumnId::MOST_COMMON_VALS,
ColumnId::MOST_COMMON_FREQS, ColumnId::HISTOGRAM_BOUNDS,
ColumnId::COLUMN_NAME, ColumnId::HAS_INDEX});
oid_t index_offset = IndexId::SECONDARY_KEY_1; // Secondary key index
std::vector<type::Value> values;
values.push_back(type::ValueFactory::GetIntegerValue(database_id).Copy());
values.push_back(type::ValueFactory::GetIntegerValue(table_id).Copy());
auto result_tiles =
GetResultWithIndexScan(column_ids, index_offset, values, txn);
PELOTON_ASSERT(result_tiles->size() <= 1); // unique
if (result_tiles->size() == 0) {
return 0;
}
auto tile = (*result_tiles)[0].get();
size_t tuple_count = tile->GetTupleCount();
LOG_DEBUG("Tuple count: %lu", tuple_count);
if (tuple_count == 0) {
return 0;
}
type::Value num_rows, cardinality, frac_null, most_common_vals,
most_common_freqs, hist_bounds, column_name, has_index;
for (size_t tuple_id = 0; tuple_id < tuple_count; ++tuple_id) {
num_rows = tile->GetValue(tuple_id, 1 + ColumnStatsOffset::NUM_ROWS_OFF);
cardinality =
tile->GetValue(tuple_id, 1 + ColumnStatsOffset::CARDINALITY_OFF);
frac_null = tile->GetValue(tuple_id, 1 + ColumnStatsOffset::FRAC_NULL_OFF);
most_common_vals =
tile->GetValue(tuple_id, 1 + ColumnStatsOffset::COMMON_VALS_OFF);
most_common_freqs =
tile->GetValue(tuple_id, 1 + ColumnStatsOffset::COMMON_FREQS_OFF);
hist_bounds =
tile->GetValue(tuple_id, 1 + ColumnStatsOffset::HIST_BOUNDS_OFF);
column_name =
tile->GetValue(tuple_id, 1 + ColumnStatsOffset::COLUMN_NAME_OFF);
has_index = tile->GetValue(tuple_id, 1 + ColumnStatsOffset::HAS_INDEX_OFF);
std::unique_ptr<std::vector<type::Value>> column_stats(
new std::vector<type::Value>({num_rows, cardinality, frac_null,
most_common_vals, most_common_freqs,
hist_bounds, column_name, has_index}));
oid_t column_id = tile->GetValue(tuple_id, 0).GetAs<int>();
column_stats_map[column_id] = std::move(column_stats);
}
return tuple_count;
}
} // namespace catalog
} // namespace peloton