/*
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* Copyright (C) 2019 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "src/trace_processor/counter_definitions_table.h"
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#include <string>
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#include "src/trace_processor/storage_columns.h"
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namespace perfetto {
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namespace trace_processor {
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CounterDefinitionsTable::CounterDefinitionsTable(sqlite3*,
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const TraceStorage* storage)
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: storage_(storage) {}
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void CounterDefinitionsTable::RegisterTable(sqlite3* db,
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const TraceStorage* storage) {
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Table::Register<CounterDefinitionsTable>(db, storage, "counter_definitions");
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}
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StorageSchema CounterDefinitionsTable::CreateStorageSchema() {
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const auto& cs = storage_->counter_definitions();
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return StorageSchema::Builder()
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.AddGenericNumericColumn("counter_id", RowAccessor())
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.AddStringColumn("name", &cs.name_ids(), &storage_->string_pool())
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.AddNumericColumn("ref", &cs.refs())
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.AddStringColumn("ref_type", &cs.types(), &GetRefTypeStringMap())
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.Build({"counter_id"});
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}
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uint32_t CounterDefinitionsTable::RowCount() {
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return storage_->counter_definitions().size();
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}
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int CounterDefinitionsTable::BestIndex(const QueryConstraints& qc,
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BestIndexInfo* info) {
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info->estimated_cost = EstimateCost(qc);
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// Only the string columns are handled by SQLite
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size_t name_index = schema().ColumnIndexFromName("name");
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size_t ref_type_index = schema().ColumnIndexFromName("ref_type");
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info->order_by_consumed = true;
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for (size_t i = 0; i < qc.constraints().size(); i++) {
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auto col = static_cast<size_t>(qc.constraints()[i].iColumn);
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info->omit[i] = col != name_index && col != ref_type_index;
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}
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return SQLITE_OK;
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}
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uint32_t CounterDefinitionsTable::EstimateCost(const QueryConstraints& qc) {
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// If there is a constraint on the counter id, we can efficiently filter
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// to a single row.
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if (HasEqConstraint(qc, "counter_id"))
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return 1;
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auto eq_name = HasEqConstraint(qc, "name");
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auto eq_ref = HasEqConstraint(qc, "ref");
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auto eq_ref_type = HasEqConstraint(qc, "ref_type");
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// If there is a constraint on all three columns, we are going to only return
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// exaclty one row for sure so make the cost 1.
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if (eq_name && eq_ref && eq_ref_type)
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return 1;
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else if (eq_name && eq_ref)
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return 10;
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else if (eq_name)
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return 100;
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return RowCount();
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}
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} // namespace trace_processor
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} // namespace perfetto
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