revert dataFormatSupport change

Author: johannes-vogel

hana/lib/drivers/hdb.js

@@ -4,11 +4,22 @@ const { text } = require('stream/consumers')
 
 const hdb = require('hdb')
 const iconv = require('iconv-lite')
+const cds = require('@sap/cds')
 
 const { driver, prom, handleLevel } = require('./base')
 const { resultSetStream } = require('./stream')
 const { wrap_client } = require('./dynatrace')
 
+if (cds.env.features.sql_simple_queries === 3) {
+  // Make hdb return true / false
+  const Reader = require('hdb/lib/protocol/Reader.js')
+  Reader.prototype._readTinyInt = Reader.prototype.readTinyInt
+  Reader.prototype.readTinyInt = function () {
+    const ret = this._readTinyInt()
+    return ret == null ? ret : !!ret
+  }
+}
+
 const credentialMappings = [
   { old: 'certificate', new: 'ca' },
   { old: 'encrypt', new: 'useTLS' },
@@ -24,7 +35,6 @@ class HDBDriver extends driver {
   constructor(creds) {
     creds = {
       fetchSize: 1 << 16, // V8 default memory page size
-      dataFormatSupport: 7, // with 7 hana supports booleans
       ...creds,
     }