feat: add search column with @Common.Text annotation

db-service/lib/search.js

@@ -94,13 +94,18 @@ const _getSearchableColumns = entity => {
     if (annotatedColumnValue) return true
 
     // calculated elements are only searchable if requested through `@cds.search` 
-    if(column.value) return false
+    if (column.value) return false
 
     // if at least one element is explicitly annotated as searchable, e.g.:
     // `@cds.search { element1: true }` or `@cds.search { element1 }`
     // and it is not the current column name, then it must be excluded from the search
     if (atLeastOneColumnIsSearchable) return false
 
+    if (element?.['@Common.Text']?.['='] && element?.isAssociation) {
+      deepSearchCandidates.push({ ref: element['@Common.Text']['='].split('.') })
+      return false
+    } 
+
     // the element is considered searchable if it is explicitly annotated as such or
     // if it is not annotated and the column is typed as a string (excluding elements/elements expressions)
     return (

test/bookshop/db/data/sap.capire.bookshop-Books.csv

@@ -1,5 +1,5 @@
 ID;title;descr;author_ID;stock;price;currency_code;genre_ID
-201;Wuthering Heights;"Wuthering Heights, Emily Brontë's only novel, was published in 1847 under the pseudonym ""Ellis Bell"". It was written between October 1845 and June 1846. Wuthering Heights and Anne Brontë's Agnes Grey were accepted by publisher Thomas Newby before the success of their sister Charlotte's novel Jane Eyre. After Emily's death, Charlotte edited the manuscript of Wuthering Heights and arranged for the edited version to be published as a posthumous second edition in 1850.";101;12;11.11;GBP;11
+201;Wuthering Heights;"Wuthering Heights was published in 1847 under the pseudonym ""Ellis Bell"". It was written between October 1845 and June 1846. Wuthering Heights and Anne Brontë's Agnes Grey were accepted by publisher Thomas Newby before the success of their sister Charlotte's novel Jane Eyre.";101;12;11.11;GBP;11
 207;Jane Eyre;"Jane Eyre /ɛər/ (originally published as Jane Eyre: An Autobiography) is a novel by English writer Charlotte Brontë, published under the pen name ""Currer Bell"", on 16 October 1847, by Smith, Elder & Co. of London. The first American edition was published the following year by Harper & Brothers of New York. Primarily a bildungsroman, Jane Eyre follows the experiences of its eponymous heroine, including her growth to adulthood and her love for Mr. Rochester, the brooding master of Thornfield Hall. The novel revolutionised prose fiction in that the focus on Jane's moral and spiritual development is told through an intimate, first-person narrative, where actions and events are coloured by a psychological intensity. The book contains elements of social criticism, with a strong sense of Christian morality at its core and is considered by many to be ahead of its time because of Jane's individualistic character and how the novel approaches the topics of class, sexuality, religion and feminism.";107;11;12.34;GBP;11
 251;The Raven;"""The Raven"" is a narrative poem by American writer Edgar Allan Poe. First published in January 1845, the poem is often noted for its musicality, stylized language, and supernatural atmosphere. It tells of a talking raven's mysterious visit to a distraught lover, tracing the man's slow fall into madness. The lover, often identified as being a student, is lamenting the loss of his love, Lenore. Sitting on a bust of Pallas, the raven seems to further distress the protagonist with its constant repetition of the word ""Nevermore"". The poem makes use of folk, mythological, religious, and classical references.";150;333;13.13;USD;16
 252;Eleonora;"""Eleonora"" is a short story by Edgar Allan Poe, first published in 1842 in Philadelphia in the literary annual The Gift. It is often regarded as somewhat autobiographical and has a relatively ""happy"" ending.";150;555;14;USD;15

test/bookshop/db/schema.cds

@@ -10,6 +10,7 @@ entity Books : managed {
   key ID             : Integer;
       title          : localized String(111);
       descr          : localized String(1111);
+      @Common.Text   : author.name
       author         : Association to Authors;
       genre          : Association to Genres default 10;
       stock          : Integer;

test/scenarios/bookshop/search.test.js

@@ -65,6 +65,13 @@ describe.skip('Bookshop - Search', () => {
       }
     })
 
+    test('Search books and author.name', async () => {
+      const res = await GET('/admin/Books?$search="Emily"', admin)
+      expect(res.status).to.be.eq(200)
+      expect(res.data.value.length).to.be.eq(2)
+      expect(res.data.value[0].title).to.be.eq('Wuthering Heights')
+    })
+
     test('Search authors via books', async () => {
       const { Books } = cds.entities
       // ad-hoc search expression