revert caching of some large predicates that caused the DB size to increase too much

python/ql/lib/semmle/python/AstExtended.qll

@@ -18,11 +18,7 @@ abstract class AstNode extends AstNode_ {
    * NOTE: For some statements and other purely syntactic elements,
    * there may not be a `ControlFlowNode`
    */
-  cached
-  ControlFlowNode getAFlowNode() {
-    Stages::AST::ref() and
-    py_flow_bb_node(result, this, _, _)
-  }
+  ControlFlowNode getAFlowNode() { py_flow_bb_node(result, this, _, _) }
 
   /** Gets the location for this AST node */
   cached
@@ -58,11 +54,7 @@ abstract class AstNode extends AstNode_ {
   }
 
   /** Whether this contains `inner` syntactically */
-  cached
-  predicate contains(AstNode inner) {
-    Stages::AST::ref() and
-    this.getAChildNode+() = inner
-  }
+  predicate contains(AstNode inner) { this.getAChildNode+() = inner }
 
   pragma[noinline]
   private predicate containsInScope(AstNode inner, Scope scope) {

python/ql/lib/semmle/python/Flow.qll

@@ -194,9 +194,7 @@ class ControlFlowNode extends @py_flow_node {
   BasicBlock getBasicBlock() { result.contains(this) }
 
   /** Gets the scope containing this flow node */
-  cached
   Scope getScope() {
-    Stages::AST::ref() and
     if this.getNode() instanceof Scope
     then
       /* Entry or exit node */

python/ql/lib/semmle/python/internal/CachedStages.qll

@@ -76,10 +76,6 @@ module Stages {
       or
       exists(any(AstExtended::AstNode n).getParentNode())
       or
-      any(AstExtended::AstNode n).contains(_)
-      or
-      exists(any(AstExtended::AstNode n).getAFlowNode())
-      or
       exists(any(PyFlow::BasicBlock b).getImmediateDominator())
       or
       any(PyFlow::BasicBlock b).strictlyDominates(_)
@@ -170,8 +166,6 @@ module Stages {
       exists(any(Flow::ControlFlowNode c).toString())
       or
       exists(any(ObjectInternal::ObjectInternal o).toString())
-      or
-      exists(any(ObjectAPI::Value::named(_)))
     }
   }
 

python/ql/lib/semmle/python/objects/ObjectAPI.qll

@@ -10,7 +10,6 @@ private import semmle.python.pointsto.PointsTo
 private import semmle.python.pointsto.PointsToContext
 private import semmle.python.pointsto.MRO
 private import semmle.python.types.Builtins
-private import semmle.python.internal.CachedStages
 
 /*
  * Use the term `ObjectSource` to refer to DB entity. Either a CFG node
@@ -264,9 +263,7 @@ module Value {
    * object of that name.
    * For example `Value::named("len")` is the `Value` representing the `len` built-in function.
    */
-  cached
   Value named(string name) {
-    Stages::DataFlow::ref() and
     exists(string modname, string attrname | name = modname + "." + attrname |
       result = Module::named(modname).attr(attrname)
     )