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Better optimization for InnoDB and BDB tables for ORDER BY

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Build-tools/Do-compile:
  Merge with 4.0
Docs/manual.texi:
  Changelog
mysql-test/r/innodb.result:
  New tests cases for ORDER BY
mysql-test/r/myisam.result:
  New tests cases for ORDER BY
mysql-test/t/innodb.test:
  New tests cases for ORDER BY
mysql-test/t/myisam.test:
  New tests cases for ORDER BY
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2001-11-29 15:34:37 +02:00
parent 00d80ffff1
commit ace649189d
10 changed files with 143 additions and 7 deletions
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sql/handler.h
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@ -223,6 +223,7 @@ public:
{ return ulonglong2double(data_file_length) / IO_SIZE + 1; }
virtual double read_time(ha_rows rows) { return rows; }
virtual bool fast_key_read() { return 0;}
virtual key_map keys_to_use_for_scanning() { return 0; }
virtual bool has_transactions(){ return 0;}
virtual uint extra_rec_buf_length() { return 0; }
virtual ha_rows estimate_number_of_rows() { return records+EXTRA_RECORDS; }