julianhyde commented on a change in pull request #1102: [CALCITE-1515]
RelBuilder supports creating TableFunctionScan
URL: https://github.com/apache/calcite/pull/1102#discussion_r265401998
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File path: core/src/test/java/org/apache/calcite/test/RelBuilderTest.java
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@@ -298,6 +298,23 @@
assertThat(root, hasTree(expected));
}
+ @Test public void testTableFunctionScan() {
+ // Equivalent SQL:
+ // SELECT *
+ // FROM TABLE(DEDUP(CURSOR(select * from emp), CURSOR(select * from
DEPT), 'NAME'))
+ final RelBuilder builder = RelBuilder.create(config().build());
+ RelNode root = builder.scan("EMP").scan("DEPT")
+ .functionScan(new MockSqlOperatorTable.DedupFunction(),
+ Lists.newArrayList(builder.cursor(0),
+ builder.cursor(1))).build();
+ final String expected = "LogicalTableFunctionScan(invocation="
+ + "[DEDUP(CURSOR($0), CURSOR($1))], "
+ + "rowType=[RecordType(VARCHAR(1024) NAME)])\n"
+ + " LogicalTableScan(table=[[scott, EMP]])\n"
+ + " LogicalTableScan(table=[[scott, DEPT]])\n";
+ assertThat(root, hasTree(expected));
+ }
Review comment:
Add an assert that builder's stack is now empty. (functionScan should have
popped both the EMP and DEPT scans, though I suspect it doesn't currently.)
I think the best way to check is to call builder.build() and make sure that
it throws. Or perhaps call builder.toString(), and make sure that it is empty.
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