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update
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@ -19,6 +19,7 @@
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package org.apache.druid.sql.calcite.run;
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import com.google.errorprone.annotations.Immutable;
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import org.apache.calcite.rel.RelNode;
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import java.io.Closeable;
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import java.util.ArrayList;
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@ -30,10 +31,11 @@ import java.util.Objects;
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@FunctionalInterface
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public interface DruidHook<T>
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{
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@Immutable
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class HookKey<T>
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{
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private String label;
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private Class<T> type;
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private final String label;
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private final Class<T> type;
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public HookKey(String label, Class<T> type)
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{
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