use hana data format version 7 for bool support

Author: johannes-vogel

hana/lib/drivers/hdb.js

@@ -2,24 +2,13 @@ const { Readable, Stream, promises: { pipeline } } = require('stream')
 const { StringDecoder } = require('string_decoder')
 const { text } = require('stream/consumers')
 
-const cds = require('@sap/cds')
 const hdb = require('hdb')
 const iconv = require('iconv-lite')
 
 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' },
@@ -35,6 +24,7 @@ class HDBDriver extends driver {
   constructor(creds) {
     creds = {
       fetchSize: 1 << 16, // V8 default memory page size
+      dataFormatSupport: 7, // with 7 hana supports booleans
       ...creds,
     }