[...]

> Summary: SQLs with LEFT JOINs on ver. 7.4.03.31 are executed 
> faster than SQLs with LEFT JOINs on version 7.4.03.32.

Not necessarily.
 
> How can I resolve this problem. I will be grateful for all 
> information and advices.

Have you updated the statistics? They are _not_ created/restored autonagically.

HTH
Christian

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