111 lines
3.9 KiB
C++
111 lines
3.9 KiB
C++
// Modifications copyright (C) 2017, Baidu.com, Inc.
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// Copyright 2017 The Apache Software Foundation
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// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. 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,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#include "exec/schema_scanner/schema_charsets_scanner.h"
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#include "runtime/primitive_type.h"
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#include "runtime/string_value.h"
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namespace palo {
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SchemaScanner::ColumnDesc SchemaCharsetsScanner::_s_css_columns[] = {
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// name, type, size
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{ "CHARACTER_SET_NAME", TYPE_VARCHAR, sizeof(StringValue), false},
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{ "DEFAULT_COLLATE_NAME", TYPE_VARCHAR, sizeof(StringValue), false},
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{ "DESCRIPTION", TYPE_VARCHAR, sizeof(StringValue), false},
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{ "MAXLEN", TYPE_BIGINT, sizeof(int64_t), false},
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};
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SchemaCharsetsScanner::CharsetStruct SchemaCharsetsScanner::_s_charsets[] = {
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{ "utf8", "utf8_general_ci", "UTF-8 Unicode", 3 },
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{ NULL, NULL, 0 },
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};
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SchemaCharsetsScanner::SchemaCharsetsScanner() :
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SchemaScanner(_s_css_columns, sizeof(_s_css_columns) / sizeof(SchemaScanner::ColumnDesc)),
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_index(0) {
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}
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SchemaCharsetsScanner::~SchemaCharsetsScanner() {
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}
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Status SchemaCharsetsScanner::fill_one_row(Tuple *tuple, MemPool *pool) {
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// variables names
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{
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void *slot = tuple->get_slot(_tuple_desc->slots()[0]->tuple_offset());
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StringValue *str_slot = reinterpret_cast<StringValue*>(slot);
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int len = strlen(_s_charsets[_index].charset);
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str_slot->ptr = (char *)pool->allocate(len + 1);
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if (NULL == str_slot->ptr) {
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return Status("No Memory.");
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}
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memcpy(str_slot->ptr, _s_charsets[_index].charset, len + 1);
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str_slot->len = len;
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}
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// DEFAULT_COLLATE_NAME
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{
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void *slot = tuple->get_slot(_tuple_desc->slots()[1]->tuple_offset());
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StringValue *str_slot = reinterpret_cast<StringValue*>(slot);
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int len = strlen(_s_charsets[_index].default_collation);
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str_slot->ptr = (char *)pool->allocate(len + 1);
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if (NULL == str_slot->ptr) {
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return Status("No Memory.");
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}
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memcpy(str_slot->ptr, _s_charsets[_index].default_collation, len + 1);
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str_slot->len = len;
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}
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// DESCRIPTION
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{
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void *slot = tuple->get_slot(_tuple_desc->slots()[2]->tuple_offset());
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StringValue *str_slot = reinterpret_cast<StringValue*>(slot);
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int len = strlen(_s_charsets[_index].description);
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str_slot->ptr = (char *)pool->allocate(len + 1);
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if (NULL == str_slot->ptr) {
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return Status("No Memory.");
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}
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memcpy(str_slot->ptr, _s_charsets[_index].description, len + 1);
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str_slot->len = len;
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}
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// maxlen
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{
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void *slot = tuple->get_slot(_tuple_desc->slots()[3]->tuple_offset());
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*(int64_t*)slot = _s_charsets[_index].maxlen;
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}
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_index++;
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return Status::OK;
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}
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Status SchemaCharsetsScanner::get_next_row(Tuple *tuple, MemPool *pool, bool *eos) {
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if (!_is_init) {
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return Status("call this before initial.");
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}
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if (NULL == _s_charsets[_index].charset) {
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*eos = true;
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return Status::OK;
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}
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if (NULL == tuple || NULL == pool || NULL == eos) {
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return Status("invalid parameter.");
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}
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*eos = false;
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return fill_one_row(tuple, pool);
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}
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}
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