ccaominh commented on a change in pull request #8373: Speed up
ExpressionSelectors.makeExprEvalSelector
URL: https://github.com/apache/incubator-druid/pull/8373#discussion_r316902313
##########
File path: core/src/main/java/org/apache/druid/math/expr/ExprMacroTable.java
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@@ -97,9 +99,13 @@ public Expr get(final String functionName, final List<Expr>
args)
{
protected final Expr arg;
+ // Use Supplier to memoize values as
ExpressionSelectors#makeExprEvalSelector() can make repeated calls for them
+ private final Supplier<BindingDetails> analyzeInputsSupplier;
+
public BaseScalarUnivariateMacroFunctionExpr(Expr arg)
{
this.arg = arg;
+ analyzeInputsSupplier = Suppliers.memoize(this::supplyAnalyzeInputs);
Review comment:
What do you mean by lazily memoize? Do you mean to lazily instantiate the
`Supplier`?
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