Airblader commented on a change in pull request #17264:
URL: https://github.com/apache/flink/pull/17264#discussion_r712284595
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File path:
flink-connectors/flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/dialect/AbstractDialect.java
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@@ -18,80 +18,252 @@
package org.apache.flink.connector.jdbc.dialect;
-import org.apache.flink.table.api.TableSchema;
+import org.apache.flink.annotation.PublicEvolving;
import org.apache.flink.table.api.ValidationException;
import org.apache.flink.table.types.DataType;
import org.apache.flink.table.types.logical.DecimalType;
import org.apache.flink.table.types.logical.LogicalTypeRoot;
+import org.apache.flink.table.types.logical.RowType;
import org.apache.flink.table.types.logical.TimestampType;
import org.apache.flink.table.types.logical.VarBinaryType;
+import org.apache.flink.util.Preconditions;
-import java.util.List;
+import java.util.Arrays;
+import java.util.Optional;
+import java.util.Set;
+import java.util.stream.Collectors;
-abstract class AbstractDialect implements JdbcDialect {
+import static java.lang.String.format;
+
+/**
+ * Base class for {@link JdbcDialect JdbcDialects} that implements basic data
type validation and
+ * the construction of basic {@code INSERT}, {@code UPDATE}, {@code DELETE},
and {@code SELECT}
+ * statements.
+ *
+ * <p>Implementors should be careful to check the default SQL statements are
performant for their
+ * specific dialect and override them if necessary.
+ */
+@PublicEvolving
+public abstract class AbstractDialect implements JdbcDialect {
Review comment:
I actually forgot about the validation of supported types when I wrote
that, and I agree with you that that is worth keeping since it applies
universally to all implementations. My comment was more directed at the
precision validation and the separate API methods introduced for that where I
think they don't enough benefit to warrant their own APIs.
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