jcralmeida commented on a change in pull request #11507: URL: https://github.com/apache/arrow/pull/11507#discussion_r746825327
########## File path: cpp/src/arrow/flight/flight_sql/example/sqlite_server.cc ########## @@ -0,0 +1,676 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +#include <arrow/api.h> +#include <arrow/flight/flight_sql/example/sqlite_server.h> +#include <arrow/flight/flight_sql/example/sqlite_statement.h> +#include <arrow/flight/flight_sql/example/sqlite_statement_batch_reader.h> +#include <arrow/flight/flight_sql/example/sqlite_tables_schema_batch_reader.h> +#include <arrow/flight/flight_sql/server.h> +#include <sqlite3.h> + +#include <boost/algorithm/string.hpp> +#include <boost/lexical_cast.hpp> +#include <boost/uuid/uuid.hpp> +#include <boost/uuid/uuid_io.hpp> +#include <sstream> + +namespace arrow { +namespace flight { +namespace sql { +namespace example { + +std::shared_ptr<DataType> GetArrowType(const char* sqlite_type) { + if (sqlite_type == NULLPTR) { + // SQLite may not know the column type yet. + return null(); + } + + if (boost::iequals(sqlite_type, "int") || boost::iequals(sqlite_type, "integer")) { + return int64(); + } else if (boost::iequals(sqlite_type, "REAL")) { + return float64(); + } else if (boost::iequals(sqlite_type, "BLOB")) { + return binary(); + } else if (boost::iequals(sqlite_type, "TEXT") || + boost::istarts_with(sqlite_type, "char") || + boost::istarts_with(sqlite_type, "varchar")) { + return utf8(); + } else { + return null(); + } +} + +std::string PrepareQueryForGetTables(const GetTables& command) { + std::stringstream table_query; + + table_query << "SELECT null as catalog_name, null as schema_name, name as " + "table_name, type as table_type FROM sqlite_master where 1=1"; + + if (command.catalog.has_value()) { + table_query << " and catalog_name='" << command.catalog.value() << "'"; + } + + if (command.schema_filter_pattern.has_value()) { + table_query << " and schema_name LIKE '" << command.schema_filter_pattern.value() + << "'"; + } + + if (command.table_name_filter_pattern.has_value()) { + table_query << " and table_name LIKE '" << command.table_name_filter_pattern.value() + << "'"; + } + + if (!command.table_types.empty()) { + table_query << " and table_type IN ("; + size_t size = command.table_types.size(); + for (size_t i = 0; i < size; i++) { + table_query << "'" << command.table_types[i] << "'"; + if (size - 1 != i) { + table_query << ","; + } + } + + table_query << ")"; + } + + table_query << " order by table_name"; + return table_query.str(); +} + +Status SetParametersOnSQLiteStatement(sqlite3_stmt* stmt, FlightMessageReader* reader) { + FlightStreamChunk chunk; + while (true) { + RETURN_NOT_OK(reader->Next(&chunk)); + std::shared_ptr<RecordBatch>& record_batch = chunk.data; + if (record_batch == nullptr) break; + + const int64_t num_rows = record_batch->num_rows(); + const int& num_columns = record_batch->num_columns(); + + for (int i = 0; i < num_rows; ++i) { + for (int c = 0; c < num_columns; ++c) { + const std::shared_ptr<Array>& column = record_batch->column(c); + ARROW_ASSIGN_OR_RAISE(std::shared_ptr<Scalar> scalar, column->GetScalar(i)); + + auto& holder = static_cast<DenseUnionScalar&>(*scalar).value; + + switch (holder->type->id()) { + case Type::INT64: { + int64_t value = static_cast<Int64Scalar&>(*holder).value; + sqlite3_bind_int64(stmt, c + 1, value); + break; + } + case Type::FLOAT: { + double value = static_cast<FloatScalar&>(*holder).value; + sqlite3_bind_double(stmt, c + 1, value); + break; + } + case Type::STRING: { + std::shared_ptr<Buffer> buffer = static_cast<StringScalar&>(*holder).value; + sqlite3_bind_text(stmt, c + 1, reinterpret_cast<const char*>(buffer->data()), + static_cast<int>(buffer->size()), SQLITE_TRANSIENT); + break; + } + case Type::BINARY: { + std::shared_ptr<Buffer> buffer = static_cast<BinaryScalar&>(*holder).value; + sqlite3_bind_blob(stmt, c + 1, buffer->data(), + static_cast<int>(buffer->size()), SQLITE_TRANSIENT); + break; + } + default: + return Status::Invalid("Received unsupported data type: ", + holder->type->ToString()); + } + } + } + } + + return Status::OK(); +} + +SQLiteFlightSqlServer::SQLiteFlightSqlServer(sqlite3* db) : db_(db), uuid_generator_({}) { + assert(db_); +} + +arrow::Result<std::shared_ptr<SQLiteFlightSqlServer>> SQLiteFlightSqlServer::Create() { + sqlite3* db = nullptr; + + if (sqlite3_open(":memory:", &db)) { + std::string err_msg = "Can't open database: "; + if (db != nullptr) { + err_msg += sqlite3_errmsg(db); + sqlite3_close(db); + } else { + err_msg += "Unable to start SQLite. Insufficient memory"; + } + + return Status::RError(err_msg); + } + + std::shared_ptr<SQLiteFlightSqlServer> result(new SQLiteFlightSqlServer(db)); + + ARROW_UNUSED(result->ExecuteSql(R"( Review comment: Fixed, we didn't noticed -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@arrow.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
