Refactor routing logics and remove unused lookups

[oneonestar]

Description

Refactor the code to separate Query ID/Cookie-based routing from new query submission routing.

Remove the unnecessary getExternalUrlForQueryId and getRoutingGroupForQueryId methods, along with their related DAOs and caches. The externalUrl and routingGroup fields are stored for newly submitted queries as before.

Additional context and related issues

getExternalUrlForQueryId and getRoutingGroupForQueryId are only used when a Query ID exists. However, their results are never persisted back to the database. We only store query history for newly submitted queries:

trino-gateway/gateway-ha/src/main/java/io/trino/gateway/proxyserver/ProxyRequestHandler.java

Lines 190 to 196 in 5bf67f3

	if (statementPaths.stream().anyMatch(request.getUri().getPath()::startsWith) && request.getMethod().equals(HttpMethod.POST)) {
	Optional<String> username = ((TrinoRequestUser) servletRequest.getAttribute(TRINO_REQUEST_USER)).getUser();
	future = future.transform(response -> recordBackendForQueryId(request, response, username, routingDestination), executor);
	if (includeClusterInfoInResponse) {
	cookieBuilder.add(new NewCookie.Builder("trinoClusterHost").value(remoteUri.getHost()).build());
	}
	}

For newly submitted queries, externalUrl and routingGroup are stored here, so this refactoring won't affect the existing behavoir:

trino-gateway/gateway-ha/src/main/java/io/trino/gateway/ha/handler/RoutingTargetHandler.java

Lines 94 to 114 in 5bf67f3

	private RoutingTargetResponse getRoutingTargetResponse(HttpServletRequest request)
	{
	RoutingSelectorResponse routingDestination = routingGroupSelector.findRoutingDestination(request);
	String user = request.getHeader(USER_HEADER);
	// This falls back on default routing group backend if there is no cluster found for the routing group.
	String routingGroup = !isNullOrEmpty(routingDestination.routingGroup())
	? routingDestination.routingGroup()
	: defaultRoutingGroup;
	ProxyBackendConfiguration backendConfiguration = routingManager.provideBackendConfiguration(routingGroup, user);
	String clusterHost = backendConfiguration.getProxyTo();
	String externalUrl = backendConfiguration.getExternalUrl();
	// Apply headers from RoutingDestination if there are any
	HttpServletRequest modifiedRequest = request;
	if (!routingDestination.externalHeaders().isEmpty()) {
	modifiedRequest = new HeaderModifyingRequestWrapper(request, routingDestination.externalHeaders());
	}
	return new RoutingTargetResponse(
	new RoutingDestination(routingGroup, clusterHost, buildUriWithNewCluster(clusterHost, request), externalUrl),
	modifiedRequest);
	}

Release notes

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