fix: pass through map type as normal ref

db-service/lib/cqn4sql.js

@@ -1266,7 +1266,7 @@ function cqn4sql(originalQuery, model) {
         }
       })
       return flatColumns
-    } else if (element.elements) {
+    } else if (element.elements && element.type !== 'cds.Map') {
       const flatRefs = []
       Object.values(element.elements).forEach(e => {
         const alias = columnAlias ? `${columnAlias}_${e.name}` : null

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

@@ -0,0 +1,2 @@
+ID;map
+0;{"key": "value"}

test/bookshop/db/schema.cds

@@ -67,5 +67,11 @@ entity C : managed {
       B   : Integer;
       toB : Composition of many B
               on toB.ID = $self.B;
-};
+}
+
+entity Maps {
+  key ID  : Integer;
+      map : Map;
+}
+
 entity BooksAnnotated as projection on Books;

test/compliance/literals.test.js

@@ -56,4 +56,10 @@ describe('literals', () => {
       throw new Error('not supported')
     })
   })
+
+  describe('maps', () => {
+    test.skip('missing', () => {
+      throw new Error('not supported')
+    })
+  })
 })

test/compliance/resources/db/basic/literals.cds

@@ -58,6 +58,10 @@ entity array {
   integer : array of Integer;
 }
 
+entity map {
+  map : Map;
+}
+
 entity binaries {
   binary      : Binary;
   largebinary : LargeBinary;

test/scenarios/bookshop/insert.test.js

@@ -62,4 +62,11 @@ describe('Bookshop - Insert', () => {
       expect(written.price).to.be.eq(entry.price)
     }
   })
+
+  test('Map', async () => {
+    await INSERT.into('sap.capire.bookshop.Maps').entries({ ID: 1, map: { key: 'insertedValue' } })
+    const result = await SELECT.from('sap.capire.bookshop.Maps')
+
+    expect(result).to.deep.eq([{ ID: 0, map: { key: 'value' } }, { ID: 1, map: { key: 'insertedValue' } }])
+  })
 })

test/scenarios/bookshop/read.test.js

@@ -370,6 +370,11 @@ describe('Bookshop - Read', () => {
     for (const row of results) expect(row).to.deep.eq([{ID: 207},{ID: 252},{ID: 271}])
   })
 
+  it('Map', async () => {
+    const result = await SELECT.from('sap.capire.bookshop.Maps')
+
+    expect(result).to.deep.eq([{ ID: 0, map: { key: 'value' } }])
+  })
   it('select all authors which have written books that have genre.name = null', async () => {
     await insertTemporaryData()
 

test/scenarios/bookshop/update.test.js

@@ -197,4 +197,11 @@ describe('Bookshop - Update', () => {
     const afterUpdate = await cds.db.run(selectRichardsBooks)
     expect(afterUpdate[0]).to.have.property('ID').that.equals(42)
   })
+
+  test('Map', async () => {
+    await UPDATE.entity('sap.capire.bookshop.Maps').where("ID=", 0).set({ map: { key: 'updatedValue' } })
+    const result = await SELECT.from('sap.capire.bookshop.Maps')
+
+    expect(result).to.deep.eq([{ ID: 0, map: { key: 'updatedValue' } }])
+  })
 })