mariadb-columnstore-engine/dbcon/mysql/is_columnstore_columns.cpp

/* c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil
 * vi: set shiftwidth=4 tabstop=4 expandtab:
 *  :indentSize=4:tabSize=4:noTabs=true:
 *
 * Copyright (C) 2016 MariaDB Corporation
 *
 * This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; version 2 of
 * the License.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

#define PREFER_MY_CONFIG_H
#include "idb_mysql.h"
#include <vector>
#include <limits>

#include <boost/shared_ptr.hpp>
#include "calpontsystemcatalog.h"
#include "dataconvert.h"
#include "exceptclasses.h"
#include "is_columnstore.h"
using namespace logging;

// Required declaration as it isn't in a MairaDB include
bool schema_table_store_record(THD* thd, TABLE* table);

ST_FIELD_INFO is_columnstore_columns_fields[] = {
    Show::Column("TABLE_SCHEMA", Show::Varchar(64), NOT_NULL),
    Show::Column("TABLE_NAME", Show::Varchar(64), NOT_NULL),
    Show::Column("COLUMN_NAME", Show::Varchar(64), NOT_NULL),
    Show::Column("OBJECT_ID", Show::ULong(0), NOT_NULL),
    Show::Column("DICTIONARY_OBJECT_ID", Show::ULong(0), NULLABLE),
    Show::Column("LIST_OBJECT_ID", Show::ULong(0), NULLABLE),
    Show::Column("TREE_OBJECT_ID", Show::ULong(0), NULLABLE),
    Show::Column("DATA_TYPE", Show::Varchar(64), NOT_NULL),
    Show::Column("COLUMN_LENGTH", Show::ULong(0), NOT_NULL),
    Show::Column("COLUMN_POSITION", Show::ULong(0), NOT_NULL),
    Show::Column("COLUMN_DEFAULT", Show::Blob(255), NULLABLE),
    Show::Column("IS_NULLABLE", Show::STiny(0), NOT_NULL),
    Show::Column("NUMERIC_PRECISION", Show::ULong(0), NOT_NULL),
    Show::Column("NUMERIC_SCALE", Show::ULong(0), NOT_NULL),
    Show::Column("IS_AUTOINCREMENT", Show::STiny(0), NOT_NULL),
    Show::Column("COMPRESSION_TYPE", Show::Varchar(64), NOT_NULL),
    Show::Column("CHARSET", Show::ULong(4), NOT_NULL),
    Show::CEnd()};

static int is_columnstore_columns_fill(THD* thd, TABLE_LIST* tables, COND* cond)
{
  CHARSET_INFO* cs = system_charset_info;
  TABLE* table = tables->table;
  InformationSchemaCond isCond;

  execplan::CalpontSystemCatalog csc;
  // Use FE path for syscat queries issued from mysqld
  csc.identity(execplan::CalpontSystemCatalog::FE);

  std::vector<
      std::pair<execplan::CalpontSystemCatalog::OID, execplan::CalpontSystemCatalog::TableName> >
      catalog_tables;
  try
  {
    catalog_tables = csc.getTables("", lower_case_table_names);
  }
  catch (IDBExcept&)
  {
    return 1;
  }
  catch (std::exception&)
  {
    return 1;
  }

  if (cond)
  {
    isCond.getCondItems(cond);
  }

  for (std::vector<std::pair<execplan::CalpontSystemCatalog::OID,
                             execplan::CalpontSystemCatalog::TableName> >::const_iterator it =
           catalog_tables.begin();
       it != catalog_tables.end(); ++it)
  {
    if (!isCond.match((*it).second.schema, (*it).second.table))
      continue;

    execplan::CalpontSystemCatalog::RIDList column_rid_list;

    // Note a table may get dropped as you iterate over the list of tables.
    // So simply ignore the dropped table.
    try
    {
      column_rid_list = csc.columnRIDs((*it).second, true, lower_case_table_names);
    }
    catch (IDBExcept& ex)
    {
      if (ex.errorCode() == ERR_TABLE_NOT_IN_CATALOG)
      {
        continue;
      }
      else
      {
        return 1;
      }
    }

    for (size_t col_num = 0; col_num < column_rid_list.size(); col_num++)
    {
      execplan::CalpontSystemCatalog::TableColName tcn = csc.colName(column_rid_list[col_num].objnum);
      execplan::CalpontSystemCatalog::ColType ct = csc.colType(column_rid_list[col_num].objnum);

      table->field[0]->store(tcn.schema.c_str(), tcn.schema.length(), cs);
      table->field[1]->store(tcn.table.c_str(), tcn.table.length(), cs);
      table->field[2]->store(tcn.column.c_str(), tcn.column.length(), cs);
      table->field[3]->store(column_rid_list[col_num].objnum);

      if (ct.ddn.dictOID == std::numeric_limits<int32_t>::min())
      {
        table->field[4]->set_null();
      }
      else
      {
        table->field[4]->set_notnull();
        table->field[4]->store(ct.ddn.dictOID);
      }

      if (ct.ddn.listOID == std::numeric_limits<int32_t>::min())
      {
        table->field[5]->set_null();
      }
      else
      {
        table->field[5]->set_notnull();
        table->field[5]->store(ct.ddn.listOID);
      }

      if (ct.ddn.treeOID == std::numeric_limits<int32_t>::min())
      {
        table->field[6]->set_null();
      }
      else
      {
        table->field[6]->set_notnull();
        table->field[6]->store(ct.ddn.treeOID);
      }

      std::string data_type = execplan::colDataTypeToString(ct.colDataType);
      table->field[7]->store(data_type.c_str(), data_type.length(), cs);
      table->field[8]->store(ct.colWidth);
      table->field[9]->store(ct.colPosition);

      if (ct.defaultValue.isNull())
      {
        table->field[10]->set_null();
      }
      else
      {
        table->field[10]->set_notnull();
        table->field[10]->store(ct.defaultValue.str(), ct.defaultValue.length(), cs);
      }

      table->field[11]->store(ct.autoincrement);
      table->field[12]->store(ct.precision);
      table->field[13]->store(ct.scale);

      if (ct.constraintType != execplan::CalpontSystemCatalog::NOTNULL_CONSTRAINT)
      {
        table->field[14]->store(true);
      }
      else
      {
        table->field[14]->store(false);
      }

      std::string compression_type;

      switch (ct.compressionType)
      {
        case 0: compression_type = "None"; break;

        case 2: compression_type = "Snappy"; break;

        case 3: compression_type = "LZ4"; break;

        default: compression_type = "Unknown"; break;
      }

      table->field[15]->store(compression_type.c_str(), compression_type.length(), cs);

      table->field[16]->store(ct.charsetNumber);

      if (schema_table_store_record(thd, table))
        return 1;
    }
  }

  return 0;
}

int is_columnstore_columns_plugin_init(void* p)
{
  ST_SCHEMA_TABLE* schema = (ST_SCHEMA_TABLE*)p;
  schema->fields_info = is_columnstore_columns_fields;
  schema->fill_table = is_columnstore_columns_fill;
  return 0;
}