korlov42 commented on a change in pull request #439:
URL: https://github.com/apache/ignite-3/pull/439#discussion_r749190562
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File path:
modules/calcite/src/main/java/org/apache/ignite/internal/processors/query/calcite/extension/SqlExtension.java
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@@ -0,0 +1,132 @@
+package org.apache.ignite.internal.processors.query.calcite.extension;
+
+import java.util.List;
+import java.util.Set;
+import org.apache.calcite.plan.RelOptRule;
+import org.apache.calcite.plan.RelOptTable;
+import org.apache.ignite.Ignite;
+import
org.apache.ignite.internal.processors.query.calcite.exec.ExecutionContext;
+import org.apache.ignite.internal.processors.query.calcite.exec.rel.Node;
+import
org.apache.ignite.internal.processors.query.calcite.metadata.ColocationGroup;
+import
org.apache.ignite.internal.processors.query.calcite.prepare.PlannerPhase;
+import org.apache.ignite.internal.processors.query.calcite.rel.IgniteRel;
+import org.jetbrains.annotations.Nullable;
+
+/**
+ * Entry point to extend current sql engine with external storage or even
custom execution.
+ */
+public interface SqlExtension {
+ /**
+ * Returns the name of the current extension.
+ *
+ * <p>This name will be used to distinguish between different
+ * extensions. Also the {@link CatalogUpdateListener} will register
+ * provided catalog with the same name.
Review comment:
Don't sure I understand you correctly. The `CatalogUpdateListener` is a
simple functional interface. It's a matter of particular implementation how
provided catalog will be registered within Ignite's internal schema holder.
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