Performance improvement for OCA accounting reports

[jcoux]

This PR complete the PR #211 with a performance improvement for OCA accounting reports.

• Deletion of joins between tables with "OR" clauses
• Deletion of useless data generation of General Ledger report for Trial Balance report
• Customization of xlsxwriter options to limit usage of memory for xlsx files generation

[pedrobaeza]

Why this dependency here? It should be in other module

[jcoux]

Hi @pedrobaeza

I have added the cStringIO and xlsxwriter dependencies because I have override the create_xlslx_report method for "Customization of xlsxwriter options to limit usage of memory for xlsx files generation".

See lines 38 to 51 of this file.

[pedrobaeza]

But then the previous PR was incorrect. We can't mix XLSX generation with PDF generation. That should be optional through a module account_financial_report_qweb_xlsx

[jcoux]

@pedrobaeza , you're right on this point.
But it's not the subject of this PR.
I will try to do another PR for that, but I don't know when I could do that.

[pedrobaeza]

OK, thanks

[fclementic2c]

2015 Trial balance (PDF) out in 3 min pdf on a 6.2 millions account move lines database... much better

👍

[fclementic2c]

and...balance calculation validated !
kudos @jcoux for your great work !
Now we have financial reports in version 9 : fast and reliable :)

cc @jgrandguillaume

[sbidoul]

@fclementic2c @jcoux @jgrandguillaume out of curiosity, would you have a chance to time a trial balance with mis_builder on the same database? Or this method:

account-financial-reporting/mis_builder/models/aep.py

Line 413 in f9d637d

def get_balances_variation(cls, company, date_from, date_to,

[gurneyalex]

worked with julien on this. 👍

[fclementic2c]

@sbidoul I ll do the test on the same DB and PC and I will tell you.

For now we need this merged so let's do it.

[sbidoul]

@fclementic2c sure, I did not intend to slow this PR. Pure curiosity, nothing else.

Thanks for finishing this, BTW!