2.5 -> 2.6 upgrade BC break: added restrictions on aliases/identifiers #6176

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admin · 2026-01-22T15:28:15+01:00

admin commented

2026-01-22 15:28:15 +01:00

Originally created by @zerocrates on GitHub (Feb 15, 2019).

BC Break Report

Q	A
BC Break	yes
Version	any 2.6

Summary

DQL in 2.5 is very loose with what's allowed as an alias: in particular, my usage was to simply repeat the FQCN as the "alias" to avoid the distinction, and this works perfectly fine.

In 2.6 such aliases are syntax errors.

The 2.6 EBNF documentation was updated to indicate the new restriction, but I don't see mention of it elsewhere, in UPGRADING or otherwise.

Of course this would extend to other "interesting" aliases but in my particular case they're always FQCNs.

Current behavior

Given previously-working DQL of the form SELECT Example\Entity FROM Example\Entity Example\Entity ...:

[Syntax Error] line 0, col 7: Error: Expected IdentificationVariable | ScalarExpression | AggregateExpression | FunctionDeclaration | PartialObjectExpression | "(" Subselect ")" | CaseExpression, got 'Example\Entity'

Originally created by @zerocrates on GitHub (Feb 15, 2019).  ### BC Break Report  | Q | A |------------ | ------ | BC Break | yes | Version | any 2.6 #### Summary  DQL in 2.5 is very loose with what's allowed as an alias: in particular, my usage was to simply repeat the FQCN as the "alias" to avoid the distinction, and this works perfectly fine. In 2.6 such aliases are syntax errors. The 2.6 EBNF documentation was [updated](https://github.com/doctrine/orm/commit/b7bd42638dcf8aa049698f01466688ff7762953b#diff-7c3c9fc075055354b2833bdadad669beR1412) to indicate the new restriction, but I don't see mention of it elsewhere, in UPGRADING or otherwise. Of course this would extend to other "interesting" aliases but in my particular case they're always FQCNs. #### Current behavior  Given previously-working DQL of the form `SELECT Example\Entity FROM Example\Entity Example\Entity ...`: > [Syntax Error] line 0, col 7: Error: Expected IdentificationVariable | ScalarExpression | AggregateExpression | FunctionDeclaration | PartialObjectExpression | "(" Subselect ")" | CaseExpression, got 'Example\Entity'

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Reference: doctrine/archived-orm#6176