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[Kernel] Add ExpressionHandler.isSupported to check for expression support #2492

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merged 3 commits into from
Mar 13, 2024

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vkorukanti
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@vkorukanti vkorukanti commented Jan 12, 2024

Description

Having the API to tell if an expression is supported on a given input schema and expected data type, can make the Kernel make better decisions in splitting the given query predicate to a guaranteed predicate and a best-effort predicate. The proposed API is:

    /**
     * Is the given expression evaluation supported on the data with given schema?
     *
     * @param inputSchema Schema of input data on which the expression is evaluated.
     * @param expression Expression to evaluate.
     * @param outputType Expected result data type.
     * @return true if supported and false otherwise.
     */
    boolean isSupported(StructType inputSchema, Expression expression, DataType outputType);

How was this patch tested?

Unittests

@@ -378,6 +378,7 @@ class GoldenTables extends QueryTest with SharedSparkSession {

val commitInfoFile = CommitInfo(
version = Some(0L),
None,
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this is unrelated, but currently broken on the master. We don't compile when connectors when spark changes.

@vkorukanti vkorukanti merged commit c046547 into delta-io:master Mar 13, 2024
7 of 8 checks passed
@vkorukanti vkorukanti deleted the isSupportedExpr branch May 9, 2024 02:42
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2 participants