Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

sql: fix a typo #14879

Merged
merged 1 commit into from
Sep 20, 2023
Merged

sql: fix a typo #14879

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion explain-index-merge.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -50,7 +50,7 @@ For the preceding query, the optimizer chooses the union-type index merge to acc

In the output, the `type: union` information in `operator info` of the `IndexMerge_8` operator indicates that this operator is a union-type index merge. It has three child nodes. `IndexRangeScan_5` and `IndexRangeScan_6` scan the `RowID`s that meet the condition according to the range, and then the `TableRowIDScan_7` operator accurately reads all the data that meets the condition according to these `RowID`s.

For the scan operation that is performed on a specific range of data, such as `IndexRangeScan`/`TableRangeScan`, the `operator info` column in the result has additional information about the scan range compared with other scan operations like `IndexFullScan`/`TableFullScan`. In the above example, the `range:(1,+inf]` in the `IndexRangeScan_13` operator indicates that the operator scans the data from 1 to positive infinity.
For the scan operation that is performed on a specific range of data, such as `IndexRangeScan`/`TableRangeScan`, the `operator info` column in the result has additional information about the scan range compared with other scan operations like `IndexFullScan`/`TableFullScan`. In the above example, the `range:(1,+inf]` in the `IndexRangeScan_5` operator indicates that the operator scans the data from 1 to positive infinity.

```sql
EXPLAIN SELECT /*+ NO_INDEX_MERGE() */ * FROM t WHERE a > 1 AND b > 1 AND c = 1; -- Does not use index merge
Expand Down