flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/databases/oracle/dialect/OracleDialect.java [140:148]:
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    @Override
    public Set<LogicalTypeRoot> supportedTypes() {
        // The data types used in Oracle are list at:
        // https://www.techonthenet.com/oracle/datatypes.php

        return EnumSet.of(
                LogicalTypeRoot.CHAR,
                LogicalTypeRoot.VARCHAR,
                LogicalTypeRoot.BOOLEAN,
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flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/databases/sqlserver/dialect/SqlServerDialect.java [138:143]:
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    @Override
    public Set<LogicalTypeRoot> supportedTypes() {
        return EnumSet.of(
                LogicalTypeRoot.CHAR,
                LogicalTypeRoot.VARCHAR,
                LogicalTypeRoot.BOOLEAN,
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