(cds 9) Std DB functions by default (#1829)

Author: stewsk

guides/databases.md

@@ -353,10 +353,6 @@ The database services guarantee the identical behavior of these operators:
 
 In particular, the translation of `!=` to `IS NOT` in SQLite — or to `IS DISTINCT FROM` in standard SQL, or to an equivalent polyfill in SAP HANA — greatly improves the portability of your code.
 
-::: warning Runtime Only
-The operator mappings are available for runtime queries only, but not in CDS files.
-:::
-
 
 ### Session Variables {.node}
 
@@ -926,20 +922,8 @@ Instead, they protect the integrity of your data in the database layer against p
 ## Standard Database Functions
 { #functions-mappings-for-runtime-queries }
 
-A specified set of standard functions - inspired by [OData](https://docs.oasis-open.org/odata/odata/v4.01/odata-v4.01-part2-url-conventions.html#sec_StringandCollectionFunctions) and [SAP HANA](https://help.sap.com/docs/hana-cloud-database/sap-hana-cloud-sap-hana-database-sql-reference-guide/alphabetical-list-of-functions?locale=en-US) - is supported in a **database-agnostic**, hence portable way, and translated to the best-possible native SQL functions or polyfills.
-
-Those functions are automatically mapped during runtime (Node.js) already today.
-To switch on the same mappings for your CDL files, you have to set:
-
-<Config>cds.cdsc.standardDatabaseFunctions = true</Config>
-
-::: tip
-this will be the default starting with `@sap/cds-compiler >= 9` and hence is only needed for earlier versions.
-:::
+A specified set of standard functions - inspired by [OData](https://docs.oasis-open.org/odata/odata/v4.01/odata-v4.01-part2-url-conventions.html#sec_StringandCollectionFunctions) and [SAP HANA](https://help.sap.com/docs/hana-cloud-database/sap-hana-cloud-sap-hana-database-sql-reference-guide/alphabetical-list-of-functions?locale=en-US) - is supported in a **database-agnostic**, hence portable way, and translated to the best-possible native SQL functions or polyfills during runtime (currently only Node.js) and for your CDL files.
 
-<!--
-TODO: remove the above with cds9
--->
 
 ### OData standard functions