docete commented on a change in pull request #11892:
URL: https://github.com/apache/flink/pull/11892#discussion_r422475071
##########
File path:
flink-table/flink-table-api-java/src/main/java/org/apache/flink/table/api/internal/TableEnvironmentImpl.java
##########
@@ -929,16 +935,69 @@ private TableResult executeOperation(Operation operation)
{
.setPrintStyle(TableResultImpl.PrintStyle.RAW_CONTENT)
.build();
+ } else if (operation instanceof DescribeTableOperation) {
+ DescribeTableOperation describeTableOperation =
(DescribeTableOperation) operation;
+ Optional<CatalogManager.TableLookupResult> result =
+
catalogManager.getTable(describeTableOperation.getSqlIdentifier());
+ if (result.isPresent()) {
+ return
buildDescribeResult(result.get().getTable().getSchema());
+ } else {
+ throw new ValidationException(String.format(
+ "Tables or views with the
identifier '%s' doesn't exist",
+
describeTableOperation.getSqlIdentifier().asSummaryString()));
+ }
} else {
throw new
TableException(UNSUPPORTED_QUERY_IN_EXECUTE_SQL_MSG);
}
}
private TableResult buildShowResult(String[] objects) {
+ return buildResult(
+ new String[]{"result"},
+ new DataType[]{DataTypes.STRING()},
+ Arrays.stream(objects).map((c) -> new
String[]{c}).toArray(String[][]::new));
+ }
+
+ private TableResult buildDescribeResult(TableSchema schema) {
+ Map<String, String> fieldToWatermark =
+ schema.getWatermarkSpecs()
+ .stream()
+
.collect(Collectors.toMap(WatermarkSpec::getRowtimeAttribute,
WatermarkSpec::getWatermarkExpr));
+
+ Map<String, String> fieldToPrimaryKey = new HashMap<>();
+ schema.getPrimaryKey().ifPresent((p) -> {
+ List<String> columns = p.getColumns();
+ columns.forEach((c) -> fieldToPrimaryKey.put(c,
String.format("PRI(%s)", String.join(",", columns))));
+ });
+
+ Object[][] rows =
Review comment:
Not all strings. the nullable of type is boolean.
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