[
https://issues.apache.org/jira/browse/CALCITE-2885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16781526#comment-16781526
]
Ruben Quesada Lopez commented on CALCITE-2885:
----------------------------------------------
I think what is happening here is that the SqlOperandTypeInference FIRST_KNOWN
of the equals function would try to infer its parameters' type evaluating its
operands and taking the first "non-unknown" type. In our second test (the one
which fails), it would try to get the type from the MULTIPLY function using
callBinding.getValidator().deriveType(callBinding.getScope(), operand). This
deriveType will eventually call the MULTIPLY validateOperands method, and since
there is an unknown parameter (the dynamic one), it will fail.
If we reversed the equality, as in the first test, the problem did not happen
because the SqlOperandTypeInference FIRST_KNOWN will never call the MULTIPLY
derive type, since it will break before as soon as it derived the type from the
numeric literal. Right after, the SqlValidatorImpl will call inferUnknownTypes
for the equals' operands (which was not called in the previous case), and that
was the key, because that method will infer and store inside the nodeToTypeMap
that the dynamic parameter's type; and later, the MULTIPLY operands validation
will not fail.
> SqlValidatorImpl fails when processing an InferTypes.FIRST_KNOWN function
> containing a function with a dynamic parameter as first operand
> -----------------------------------------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-2885
> URL: https://issues.apache.org/jira/browse/CALCITE-2885
> Project: Calcite
> Issue Type: Bug
> Affects Versions: 1.18.0
> Reporter: Ruben Quesada Lopez
> Priority: Major
>
> Problem can be reproduced by adding following tests (e.g. to
> SqlValidatorDynamicTest.java):
> {code:java}
> @Test public void testDynamicParameter1() throws Exception {
> final String sql = "select 4 = 2*?";
> sql(sql).ok();
> }
> @Test public void testDynamicParameter2() throws Exception {
> final String sql = "select 2*? = 4";
> sql(sql).ok();
> }
> {code}
> The first test will run successfully, but the second one (which is the same
> query reversing the equals operands) will fail with the exception:
> {code}
> org.apache.calcite.sql.validate.SqlValidatorException: Cannot apply '*' to
> arguments of type '<INTEGER> * <UNKNOWN>'. Supported form(s): '<NUMERIC> *
> <NUMERIC>'
> '<DATETIME_INTERVAL> * <NUMERIC>'
> '<NUMERIC> * <DATETIME_INTERVAL>'
> {code}
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
