Hisoka-X commented on code in PR #2052:
URL: 
https://github.com/apache/incubator-seatunnel/pull/2052#discussion_r905764262


##########
seatunnel-api/src/main/java/org/apache/seatunnel/api/table/type/BasicType.java:
##########
@@ -17,69 +17,63 @@
 
 package org.apache.seatunnel.api.table.type;
 
-import java.math.BigDecimal;
-import java.math.BigInteger;
-import java.time.Instant;
-import java.util.Date;
 import java.util.Objects;
 
 public class BasicType<T> implements SeaTunnelDataType<T> {
-    private static final long serialVersionUID = 1L;
+    private static final long serialVersionUID = 2L;
 
-    public static final BasicType<String> STRING_TYPE = new 
BasicType<>(String.class);
-    public static final BasicType<Boolean> BOOLEAN_TYPE = new 
BasicType<>(Boolean.class);
-    public static final BasicType<Byte> BYTE_TYPE = new 
BasicType<>(Byte.class);
-    public static final BasicType<Short> SHORT_TYPE = new 
BasicType<>(Short.class);
-    public static final BasicType<Integer> INT_TYPE = new 
BasicType<>(Integer.class);
-    public static final BasicType<Long> LONG_TYPE = new 
BasicType<>(Long.class);
-    public static final BasicType<Float> FLOAT_TYPE = new 
BasicType<>(Float.class);
-    public static final BasicType<Double> DOUBLE_TYPE = new 
BasicType<>(Double.class);
-    public static final BasicType<Character> CHAR_TYPE = new 
BasicType<>(Character.class);
+    public static final BasicType<String> STRING_TYPE = new 
BasicType<>(String.class, SqlType.STRING);
+    public static final BasicType<Boolean> BOOLEAN_TYPE = new 
BasicType<>(Boolean.class, SqlType.BOOLEAN);
+    public static final BasicType<Byte> BYTE_TYPE = new 
BasicType<>(Byte.class, SqlType.TINYINT);
+    public static final BasicType<Short> SHORT_TYPE = new 
BasicType<>(Short.class, SqlType.SMALLINT);
+    public static final BasicType<Integer> INT_TYPE = new 
BasicType<>(Integer.class, SqlType.INT);
+    public static final BasicType<Long> LONG_TYPE = new 
BasicType<>(Long.class, SqlType.BIGINT);
+    public static final BasicType<Float> FLOAT_TYPE = new 
BasicType<>(Float.class, SqlType.FLOAT);
+    public static final BasicType<Double> DOUBLE_TYPE = new 
BasicType<>(Double.class, SqlType.DOUBLE);
+    public static final BasicType<Void> VOID_TYPE = new 
BasicType<>(Void.class, SqlType.NULL);
 
-    public static final BasicType<BigInteger> BIG_INT_TYPE = new 
BasicType<>(BigInteger.class);
-    public static final BasicType<BigDecimal> BIG_DECIMAL_TYPE = new 
BasicType<>(BigDecimal.class);
-    public static final BasicType<Instant> INSTANT_TYPE = new 
BasicType<>(Instant.class);
-    public static final BasicType<Void> VOID_TYPE = new 
BasicType<>(Void.class);
-    public static final BasicType<Date> DATE_TYPE = new 
BasicType<>(Date.class);
+    // 
--------------------------------------------------------------------------------------------
 
     /**
      * The physical type class.
      */
-    private final Class<T> physicalTypeClass;
+    private final Class<T> typeClass;
+    private final SqlType sqlType;
 
-    private BasicType(Class<T> physicalTypeClass) {
-        if (physicalTypeClass == null) {
-            throw new IllegalArgumentException("physicalTypeClass cannot be 
null");
-        }
-        this.physicalTypeClass = physicalTypeClass;
+    protected BasicType(Class<T> typeClass, SqlType sqlType) {
+        this.typeClass = typeClass;
+        this.sqlType = sqlType;
     }
 
     @Override
     public Class<T> getTypeClass() {
-        return this.physicalTypeClass;
+        return this.typeClass;
     }
 
     @Override
-    public int hashCode() {
-        return this.physicalTypeClass.hashCode();
+    public SqlType getSqlType() {
+        return this.sqlType;
     }
 
     @Override
-    public boolean equals(Object o) {
-        if (this == o) {
+    public boolean equals(Object obj) {

Review Comment:
   The sql type should be considered when equals



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