arina-ielchiieva commented on a change in pull request #1836: DRILL-7156:
Support empty Parquet files creation
URL: https://github.com/apache/drill/pull/1836#discussion_r313804193
##########
File path:
exec/java-exec/src/test/java/org/apache/drill/exec/physical/impl/writer/TestParquetWriterEmptyFiles.java
##########
@@ -43,47 +49,99 @@ public void testWriteEmptyFile() throws Exception {
final File outputFile =
FileUtils.getFile(dirTestWatcher.getDfsTestTmpDir(), outputFileName);
test("CREATE TABLE dfs.tmp.%s AS SELECT * FROM cp.`employee.json` WHERE
1=0", outputFileName);
+ Assert.assertTrue(outputFile.exists());
+ }
+
+ @Test
+ public void testWriteEmptyFileWithEmptySchema() throws Exception {
+ final String outputFileName =
"testparquetwriteremptyfiles_testwriteemptyfileemptyschema";
+ final File outputFile =
FileUtils.getFile(dirTestWatcher.getDfsTestTmpDir(), outputFileName);
+
+ test("CREATE TABLE dfs.tmp.%s AS SELECT * FROM cp.`empty.json`",
outputFileName);
Assert.assertFalse(outputFile.exists());
}
@Test
- public void testMultipleWriters() throws Exception {
- final String outputFile =
"testparquetwriteremptyfiles_testmultiplewriters";
+ public void testWriteEmptySchemaChange() throws Exception {
+ final String outputFileName =
"testparquetwriteremptyfiles_testwriteemptyschemachange";
+ final File outputFile =
FileUtils.getFile(dirTestWatcher.getDfsTestTmpDir(), outputFileName);
- runSQL("alter session set `planner.slice_target` = 1");
+ test("CREATE TABLE dfs.tmp.%s AS select id, a, b from
dfs.`schemachange/multi/*.json` WHERE id = 0", outputFileName);
- try {
- final String query = "SELECT position_id FROM cp.`employee.json` WHERE
position_id IN (15, 16) GROUP BY position_id";
+ // Only the last scan scheme is written
+ SchemaBuilder schemaBuilder = new SchemaBuilder()
+ .addNullable("id", TypeProtos.MinorType.BIGINT)
+ .addNullable("a", TypeProtos.MinorType.BIGINT)
+ .addNullable("b", TypeProtos.MinorType.BIT);
+ BatchSchema expectedSchema = new BatchSchemaBuilder()
+ .withSchemaBuilder(schemaBuilder)
+ .build();
- test("CREATE TABLE dfs.tmp.%s AS %s", outputFile, query);
+ testBuilder()
+ .unOrdered()
+ .sqlQuery("select * from dfs.tmp.%s", outputFileName)
+ .schemaBaseLine(expectedSchema)
+ .go();
- // this query will fail if an "empty" file was created
- testBuilder()
- .unOrdered()
- .sqlQuery("SELECT * FROM dfs.tmp.%s", outputFile)
- .sqlBaselineQuery(query)
- .go();
- } finally {
- runSQL("alter session set `planner.slice_target` = " +
ExecConstants.SLICE_TARGET_DEFAULT);
- }
+ // Make sure that only 1 parquet file was created
+ Assert.assertEquals(1, outputFile.list((dir, name) ->
name.endsWith("parquet")).length);
Review comment:
Static import.
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