fix: assign artificial alias if selecting from anonymous subquery #608
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patricebender
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patricebender
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danjoa,
johannes-vogel,
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Apr 23, 2024
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🤖 I have created a release *beep* *boop* --- <details><summary>db-service: 1.9.0</summary> ## [1.9.0](db-service-v1.8.0...db-service-v1.9.0) (2024-05-08) ### Added * Add missing `func` cqn structures ([#629](#629)) ([9d7539a](9d7539a)) ### Fixed * **`order by`:** reject non-fk traversals of own columns in order by ([#599](#599)) ([3288d63](3288d63)) * Align all quote functions with @sap/cds-compiler ([#619](#619)) ([42e9828](42e9828)) * assign artificial alias if selecting from anonymous subquery ([#608](#608)) ([e1a7711](e1a7711)) * avoid spread operator ([#630](#630)) ([a39fb65](a39fb65)) * flat update with arbitrary where clauses ([#598](#598)) ([f108798](f108798)) * improved `=` and `!=` with val `null` for HANA and Postgres ([#626](#626)) ([cbcfe3b](cbcfe3b)) * Improved placeholders and limit clause ([#567](#567)) ([d5d5dbb](d5d5dbb)) * multiple result responses ([#602](#602)) ([bf0bed4](bf0bed4)) * only consider persisted columns for simple operations ([#592](#592)) ([6e31bda](6e31bda)) ### Changed * require `>= sap/cds-compiler@4.9` ([f4d09e2](f4d09e2)) * require `>= sap/cds@7.9.0` ([#627](#627)) ([f4d09e2](f4d09e2)) </details> <details><summary>sqlite: 1.7.0</summary> ## [1.7.0](sqlite-v1.6.0...sqlite-v1.7.0) (2024-05-08) ### Added * select decimals as strings if cds.env.features.string_decimals ([#616](#616)) ([39addbf](39addbf)) ### Fixed * Change `sql` property to `query` for errors ([#611](#611)) ([585577a](585577a)) * **hana:** Remove encoding from hana-client streams ([#623](#623)) ([fed8f6f](fed8f6f)) * Improved placeholders and limit clause ([#567](#567)) ([d5d5dbb](d5d5dbb)) </details> <details><summary>postgres: 1.8.0</summary> ## [1.8.0](postgres-v1.7.0...postgres-v1.8.0) (2024-05-08) ### Added * select decimals as strings if cds.env.features.string_decimals ([#616](#616)) ([39addbf](39addbf)) ### Fixed * Align all quote functions with @sap/cds-compiler ([#619](#619)) ([42e9828](42e9828)) * Change `sql` property to `query` for errors ([#611](#611)) ([585577a](585577a)) * Improved placeholders and limit clause ([#567](#567)) ([d5d5dbb](d5d5dbb)) * Use json datatype for Postgres insert ([#582](#582)) ([f1c9c89](f1c9c89)) </details> <details><summary>hana: 0.3.0</summary> ## [0.3.0](hana-v0.2.0...hana-v0.3.0) (2024-05-08) ### Added * select decimals as strings if cds.env.features.string_decimals ([#616](#616)) ([39addbf](39addbf)) ### Fixed * Add multi `concat` function to `@cap-js/hana` ([#624](#624)) ([df436fe](df436fe)) * Align all quote functions with @sap/cds-compiler ([#619](#619)) ([42e9828](42e9828)) * Change `sql` property to `query` for errors ([#611](#611)) ([585577a](585577a)) * Disconnect HANA tenant when deleted ([#589](#589)) ([a107db9](a107db9)) * **hana:** Align not found behavior in @cap-js/hana ([#603](#603)) ([54d2efb](54d2efb)) * **hana:** Allow custom fuzzy search cqn ([#620](#620)) ([80383f0](80383f0)) * **hana:** Allow HANA to use != and == inside xpr combinations ([#607](#607)) ([c578e9f](c578e9f)) * **hana:** Reference column alias in order by ([#615](#615)) ([7cd3a26](7cd3a26)) * **hana:** Remove encoding from hana-client streams ([#623](#623)) ([fed8f6f](fed8f6f)) * **hana:** Support associations with static values ([#604](#604)) ([05babcf](05babcf)) * improved `=` and `!=` with val `null` for HANA and Postgres ([#626](#626)) ([cbcfe3b](cbcfe3b)) * Improved placeholders and limit clause ([#567](#567)) ([d5d5dbb](d5d5dbb)) * Use json datatype for Postgres insert ([#582](#582)) ([f1c9c89](f1c9c89)) </details> --- This PR was generated with [Release Please](https://github.com/googleapis/release-please). See [documentation](https://github.com/googleapis/release-please#release-please). --------- Co-authored-by: Johannes Vogel <johannes.vogel@sap.com> Co-authored-by: Patrice Bender <patrice.bender@sap.com>
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This is necessary if we expose an association in the inner query and traverse it in the outer query:
to come up with a proper join node, we must add a table alias around the subquery in from.
I came up with
__select__as artifical name. To make it always unique, I request a unique alias from the subquery based on__select__, the subquery knows all outer aliases and is able to calculate a universally unique alias.bugs found in #590