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https://issues.apache.org/jira/browse/DRILL-7048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16801594#comment-16801594
]
ASF GitHub Bot commented on DRILL-7048:
---------------------------------------
vvysotskyi commented on pull request #1714: DRILL-7048: Implement JDBC
Statement.setMaxRows() with System Option
URL: https://github.com/apache/drill/pull/1714#discussion_r269039279
##########
File path: exec/jdbc/src/test/java/org/apache/drill/jdbc/StatementTest.java
##########
@@ -239,4 +246,173 @@ public void testNonTriggeredQueryTimeout() throws
SQLException {
}
}
+ ////////////////////////////////////////
+ // Query maxRows methods:
+
+ /**
+ * Test for reading of default max rows
+ */
+ @Test
+ public void testDefaultGetMaxRows() throws SQLException {
+ try(Statement stmt = connection.createStatement()) {
+ int maxRowsValue = stmt.getMaxRows();
+ assertEquals(0, maxRowsValue);
+ }
+ }
+
+ /**
+ * Test Invalid parameter by giving negative maxRows value
+ */
+ @Test
+ public void testInvalidSetMaxRows() throws SQLException {
+ try (Statement stmt = connection.createStatement()) {
+ // Setting negative value
+ int valueToSet = -10;
+ try {
+ stmt.setMaxRows(valueToSet);
+ } catch ( final SQLException e) {
+ assertThat( e.getMessage(), containsString("VALIDATION ERROR: Option
exec.query.max_rows must be between 0 and ") );
+ }
+ }
+ }
+
+ /**
+ * Test setting a valid maxRows value
+ */
+ @Test
+ public void testValidSetMaxRows() throws SQLException {
+ try (Statement stmt = connection.createStatement()) {
+ // Setting positive value
+ int valueToSet = RANDOMIZER.nextInt(59)+1;
+ logger.info("Setting maximum resultset size as {} rows", valueToSet);
+ stmt.setMaxRows(valueToSet);
+ assertEquals( valueToSet, stmt.getMaxRows() );
+ }
+ }
+
+ /**
+ * Test setting maxSize as zero (i.e. no Limit)
+ */
+ @Test
+ public void testSetMaxRowsAsZero() throws SQLException {
+ try (Statement stmt = connection.createStatement()) {
+ stmt.setMaxRows(0);
+ stmt.executeQuery(SYS_OPTIONS_SQL);
+ ResultSet rs = stmt.getResultSet();
Review comment:
`ResultSet` should be also closed.
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> Implement JDBC Statement.setMaxRows() with System Option
> --------------------------------------------------------
>
> Key: DRILL-7048
> URL: https://issues.apache.org/jira/browse/DRILL-7048
> Project: Apache Drill
> Issue Type: New Feature
> Components: Client - JDBC, Query Planning & Optimization
> Affects Versions: 1.15.0
> Reporter: Kunal Khatua
> Assignee: Kunal Khatua
> Priority: Major
> Labels: doc-impacting
> Fix For: 1.17.0
>
>
> With DRILL-6960, the webUI will get an auto-limit on the number of results
> fetched.
> Since more of the plumbing is already there, it makes sense to provide the
> same for the JDBC client.
> In addition, it would be nice if the Server can have a pre-defined value as
> well (default 0; i.e. no limit) so that an _admin_ would be able to ensure a
> max limit on the resultset size as well.
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