fix: initialize tdengine schema before first write

modules/sinks/tdengine-history-store/src/main/java/com/lingniu/ingest/tdenginehistory/TdengineJdbcHistoryWriter.java

@@ -20,6 +20,8 @@ public final class TdengineJdbcHistoryWriter implements TdengineHistoryWriter {
     private final DataSource dataSource;
     private final TdengineHistorySchema schema;
     private final TdengineHistoryStatements statements;
+    private final Object schemaInitializationMonitor = new Object();
+    private volatile boolean schemaInitialized;
 
     public TdengineJdbcHistoryWriter(DataSource dataSource, TdengineHistorySchema schema) {
         if (dataSource == null) {
@@ -41,6 +43,7 @@ public final class TdengineJdbcHistoryWriter implements TdengineHistoryWriter {
                 }
             }
         });
+        schemaInitialized = true;
     }
 
     @Override
@@ -62,7 +65,29 @@ public final class TdengineJdbcHistoryWriter implements TdengineHistoryWriter {
         if (rows == null || rows.isEmpty()) {
             return;
         }
+        if (!schemaInitialized) {
+            synchronized (schemaInitializationMonitor) {
+                if (!schemaInitialized) {
+                    append(rows, mapper, true);
+                    schemaInitialized = true;
+                    return;
+                }
+            }
+        }
+        append(rows, mapper, false);
+    }
+
+    private <T> void append(List<T> rows,
+                            Function<T, TdengineBatchStatement> mapper,
+                            boolean initializeSchema) throws IOException {
         inTransaction(connection -> {
+            if (initializeSchema) {
+                try (Statement statement = connection.createStatement()) {
+                    for (String sql : schema.bootstrapSql()) {
+                        statement.execute(sql);
+                    }
+                }
+            }
             Set<String> createdChildTables = new LinkedHashSet<>();
             Map<String, PreparedStatement> preparedStatements = new LinkedHashMap<>();
             try {