morningman commented on code in PR #46026:
URL: https://github.com/apache/doris/pull/46026#discussion_r1899258576
##########
fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/client/JdbcClickHouseClient.java:
##########
@@ -121,4 +202,80 @@ protected Type jdbcTypeToDoris(JdbcFieldSchema
fieldSchema) {
return Type.UNSUPPORTED;
}
}
+
+ /**
+ * Determine whether to use catalog databaseterm.
+ * 1. If it is a new version of the driver (>=0.5.0) and
databaseTerm=catalog is specified in the URL,
+ * true will be returned.
+ * 2. If it is an old version driver (<0.5.0), always returns false.
+ */
+ private boolean isDatabaseTermCatalog() {
+ if (databaseTermIsCatalog == null) {
+ synchronized (this) {
+ if (databaseTermIsCatalog == null) {
+ databaseTermIsCatalog = determineDatabaseTerm();
+ }
+ }
+ }
+ return databaseTermIsCatalog;
+ }
+
+ /**
+ * Determines whether to use catalog databaseterm (lazy initialization).
+ */
+ private boolean determineDatabaseTerm() {
+ try (Connection conn = getConnection()) {
+ String jdbcUrl = conn.getMetaData().getURL();
+ // 获取驱动版本是否大于等于 0.5.0
Review Comment:
English
##########
fe/fe-core/src/main/java/org/apache/doris/datasource/jdbc/client/JdbcClickHouseClient.java:
##########
@@ -121,4 +202,80 @@ protected Type jdbcTypeToDoris(JdbcFieldSchema
fieldSchema) {
return Type.UNSUPPORTED;
}
}
+
+ /**
+ * Determine whether to use catalog databaseterm.
+ * 1. If it is a new version of the driver (>=0.5.0) and
databaseTerm=catalog is specified in the URL,
+ * true will be returned.
+ * 2. If it is an old version driver (<0.5.0), always returns false.
+ */
+ private boolean isDatabaseTermCatalog() {
Review Comment:
I suggest to check and fill the `databaseTermIsCatalog` when creating the
catalog.
(for old version, user can call `refresh` to fill this field, added to the
document).
So that we don't need to use this `synchronized` things, which make the code
hard to maintain.
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