yuqi1129 commented on code in PR #9821:
URL: https://github.com/apache/gravitino/pull/9821#discussion_r2757522340
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catalogs/catalog-jdbc-common/src/main/java/org/apache/gravitino/catalog/jdbc/operation/JdbcTableOperations.java:
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@@ -95,6 +100,87 @@ public void initialize(
this.columnDefaultValueConverter = jdbcColumnDefaultValueConverter;
}
+ /**
+ * Handles quoting for default values based on the column data type. For
example, if the default
+ * valur is ""(empty string), it will be represented as two single quotes ''
for string-like
+ * columns, or NULL for others.
+ *
+ * @param column the column
+ * @param defaultValueExpression the default value expression
+ * @return the properly quoted default value as a string
+ */
+ protected String handleQuotingForDefaultValue(
+ JdbcColumn column, Expression defaultValueExpression) {
+ String defaultValue =
columnDefaultValueConverter.fromGravitino(defaultValueExpression);
+
+ // Special handling for SQL NULL: do not quote it, even for string-like
columns.
+ if (Literals.NULL.equals(defaultValueExpression)) {
+ return "NULL";
+ }
+
+ // Special handling for string-like columns.
+ if (column.dataType() instanceof VarCharType
+ || column.dataType() instanceof StringType
+ || column.dataType() instanceof FixedCharType) {
+ if (StringUtils.isEmpty(defaultValue)) {
+ // Represent empty string default as two single quotes.
+ return "''";
+ }
+
+ // If the converter already produced a quoted literal, preserve it.
Review Comment:
Please see L74
https://github.com/apache/gravitino/blob/b5af4dc09db75557d0a1a874bda91b8ddc77bc5b/catalogs/catalog-jdbc-common/src/main/java/org/apache/gravitino/catalog/jdbc/converter/JdbcColumnDefaultValueConverter.java#L58-L76
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