fix: no longer support the substring function
#10242
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Jefffrey
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Apr 26, 2024
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| query T | ||
| SELECT substring('alphabet', 1) | ||
| ---- | ||
| alphabet | ||
|
|
||
| query T | ||
| SELECT substring('alphabet', 3, 2) | ||
| ---- | ||
| ph |
Co-authored-by: Jeffrey Vo <[email protected]>
Jefffrey
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Apr 26, 2024
appletreeisyellow
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Apr 26, 2024
* fix: no longer support the `substring` function * enable from-for format * update test comment * review feedback * review feedback Co-authored-by: Jeffrey Vo <[email protected]> --------- Co-authored-by: Jeffrey Vo <[email protected]>
appletreeisyellow
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* fix: no longer support the `substring` function * enable from-for format * update test comment * review feedback * review feedback Co-authored-by: Jeffrey Vo <[email protected]> --------- Co-authored-by: Jeffrey Vo <[email protected]>
appletreeisyellow
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Apr 30, 2024
* fix: no longer support the `substring` function * enable from-for format * update test comment * review feedback * review feedback Co-authored-by: Jeffrey Vo <[email protected]> --------- Co-authored-by: Jeffrey Vo <[email protected]>
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Which issue does this PR close?
Closes #10240.
Rationale for this change
Before version 0.45.0 of sqlparser, the
specialflag for bothsubstring('xxxx', 1, 2)andsubstring('xxxx' from 1 for 2)was false.After apache/datafusion-sqlparser-rs#1173, the
specialflag forsubstring('xxxx', 1, 2)becomes true.We need to support both formats as before, so there's no need to check the
specialflag.The 'from' and 'for' parameters don't support string types because they should be treated as regular expressions. Currently, substring is just an alias of
substr. This PR adds tests to verify this.Reference document: https://www.postgresql.org/docs/current/functions-string.html
What changes are included in this PR?
Re-enable
substring('xxxx', 1, 2).Are these changes tested?
Yes
Are there any user-facing changes?
No