[HIVE-25046] Log CBO plans right after major transformations - ASF JIRA

Log work

Agile Board

Rank to Top

Rank to Bottom

Bulk Copy Attachments

Bulk Move Attachments

Voters

Watch issue

Watchers

Create sub-task

Convert to sub-task

Move

Link

Clone

Labels

Update Comment Author

Replace String in Comment

Update Comment Visibility

Delete Comments

XML

Word

Printable

JSON

Details

Type: Improvement
Status: Closed
Priority: Major
Resolution: Fixed
Affects Version/s: None
Fix Version/s: 4.0.0-alpha-1
Component/s: CBO
Labels:
- pull-request-available

Target Version/s:

4.0.0

Description

Currently the results of various CBO transformations are logged (in DEBUG mode) at the end of the optimization phase and only if we are not in test mode. This has some disadvantages:

If there is a failure (exception) in some intermediate step we will miss all the intermediate plans, possibly losing track of what plan led to the problem.
Intermediate logs are very useful for identifying plan problems while working on a patch; unfortunately the logs are explicitly disabled in test mode which means that in order to appear the respective code needs to change every time we need to see those logs.
Logging at the end necessitates keeping additional local variables that make code harder to read.

The goal of this issue is to place DEBUG logging right after major transformations and independently if we are running in test mode or not to alleviate the shortcomings mentioned above.