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MDEV-6950 Bad results with joins comparing DATE/DATETIME and INT/DECIMAL/DOUBLE/ENUM/VARCHAR columns

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MDEV-6971 Bad results with joins comparing TIME and DOUBLE/DECIMAL columns
Disallow using indexes on non-temporal columns to optimize
ref access, range access and table elimination when the counterpart's
cmp_type is TIME_RESULT, e.g.:
  SELECT * FROM t1 WHERE indexed_int_column=time_expression;
Only index on a temporal column can be used to optimize temporal comparison
operations.
This commit is contained in:
Alexander Barkov 2014-11-18 16:33:29 +04:00
commit e52b1637e0
15 changed files with 505 additions and 0 deletions
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2
sql/opt_table_elimination.cc
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@ -1486,6 +1486,8 @@ void check_equality(Dep_analysis_context *ctx, Dep_module_expr **eq_mod,
left->real_item()->type() == Item::FIELD_ITEM)
{
Field *field= ((Item_field*)left->real_item())->field;
if (right->cmp_type() == TIME_RESULT && field->cmp_type() != TIME_RESULT)
return;
if (field->result_type() == STRING_RESULT)
{
if (right->result_type() != STRING_RESULT)