add emits reads to fix queries (#14462)

Author: gridnevvvit

ydb/core/kqp/host/kqp_translate.cpp

@@ -179,6 +179,7 @@ NSQLTranslation::TTranslationSettings TKqpTranslationSettingsBuilder::Build(NYql
     NSQLTranslation::TTranslationSettings settings;
     settings.PgParser = UsePgParser && *UsePgParser;
     settings.Antlr4Parser = false;
+    settings.EmitReadsForExists = true;
     if (settings.PgParser) {
         settings.AutoParametrizeEnabled = IsEnablePgConstsToParams ;
         settings.AutoParametrizeValuesStmt = IsEnablePgConstsToParams;