JeremyXin commented on code in PR #9446:
URL: https://github.com/apache/seatunnel/pull/9446#discussion_r2154391814
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seatunnel-connectors-v2/connector-clickhouse/src/main/java/org/apache/seatunnel/connectors/seatunnel/clickhouse/util/ClickhouseProxy.java:
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@@ -429,6 +438,100 @@ public void dropDatabase(String database, boolean
ignoreIfNotExists) {
executeSql(ClickhouseCatalogUtil.INSTANCE.getDropDatabaseSql(database,
ignoreIfNotExists));
}
+ public List<ClickhousePart> getPartList(
+ String database, String table, Shard shard, List<String>
partitionList) {
+
+ String sql =
+ String.format(
+ "select name from system.parts where database = '%s'
and table = '%s'",
+ database, table);
+
+ if (partitionList != null && !partitionList.isEmpty()) {
+ StringJoiner joiner = new StringJoiner("', '", "('", "')");
+ partitionList.forEach(joiner::add);
+
+ sql += " and partition in " + joiner.toString();
+ }
+
+ sql += " group by name";
+
+ log.debug("get part sql: {}", sql);
+
+ try (ClickHouseResponse response =
clickhouseRequest.query(sql).executeAndWait()) {
+ Iterable<ClickHouseRecord> records = response.records();
+ return StreamSupport.stream(records.spliterator(), false)
+ .map(r -> new ClickhousePart(r.getValue(0).asString(),
database, table, shard))
+ .collect(Collectors.toList());
+ } catch (ClickHouseException e) {
+ throw new ClickhouseConnectorException(
+ ClickhouseConnectorErrorCode.GET_PART_ERROR,
+ "Cannot get part name from system.parts",
+ e);
+ }
+ }
+
+ public List<SeaTunnelRow> getDataFromSplit(
+ ClickhousePart part,
+ SeaTunnelRowType seaTunnelRowType,
+ ClickhouseSourceTable clickhouseSourceTable,
+ int offset) {
+
+ long st = System.currentTimeMillis();
+ List<SeaTunnelRow> seaTunnelRowList = new ArrayList<>();
+ TablePath tablePath = TablePath.of(part.getDatabase(),
part.getTable());
+
+ String whereClause = String.format("_part = '%s'", part.getName());
+ if (StringUtils.isNotEmpty(clickhouseSourceTable.getFilterQuery())) {
+ whereClause += " AND (" + clickhouseSourceTable.getFilterQuery() +
")";
+ }
+
+ String sql =
+ String.format(
+ "select * from %s.%s where %s limit %d, %d",
Review Comment:
This implementation is designed to read parts in batches to avoid large
amounts of data when reading in parallel. Each `ClickhousePart` object has an
`offset` attribute to record the offset of the current part that has been read,
thereby ensuring the order of batch reading.
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