Leonid Chistov created CALCITE-5502:
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Summary: RelToSql converter generates where clause with window
expression
Key: CALCITE-5502
URL: https://issues.apache.org/jira/browse/CALCITE-5502
Project: Calcite
Issue Type: Bug
Components: jdbc-adapter
Affects Versions: 1.32.0
Reporter: Leonid Chistov
Wrong SQL code is generated when Filter (or Calc) node contains window
expression.
Example can be demonstrated by adding following code to
RelToSqlConverterTest.java:
{code:java}
@Test void testWindowedFilter() {
final RelBuilder builder = relBuilder();
final RelNode root = builder
.scan("DEPT")
.filter(
builder.lessThan(
builder.aggregateCall(SqlStdOperatorTable.MAX,
builder.field("DEPTNO"))
.over()
.partitionBy(builder.field("DNAME"))
.toRex(),
builder.literal(1)
)
)
.build();
final String expectedSql = "?";
assertThat(toSql(root), isLinux(expectedSql));
} {code}
Generated SQL code will look like:
{code:java}
SELECT *
FROM \"scott\".\"DEPT\"
WHERE (MAX(\"DEPTNO\") OVER (PARTITION BY \"DNAME\" RANGE BETWEEN UNBOUNDED
PRECEDING AND UNBOUNDED FOLLOWING)) < 1 {code}
This is incorrect - window expressions are not required in WHERE clause by SQL
standard and Calcite itself would produce following error message if this SQL
code would passed as input:
{code:java}
Windowed aggregate expression is illegal in WHERE clause {code}
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