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  1. Teiid
  2. TEIID-6043

Postgres/MSSQL: query with sum or avg of null value fails

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: Major Major
    • 15.0.1, 16.0
    • 14.0
    • JDBC Connector
    • None
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      1. In PostgreSQL create the test table using the following scripts:

      CREATE TABLE public.test
(
  expr1 integer
);

      2. Add PostgreSQL database configuration in standalone-teiid.xml:

                      <datasource jndi-name="java:/test_dwh_pg" pool-name="test_dwh_pg" enabled="true" use-java-context="true">
                    <connection-url>jdbc:postgresql://localhost:5432/test_dwh?charSet=utf8</connection-url>
                    <driver-class>org.postgresql.Driver</driver-class>
                    <driver>org.postgresql</driver>
                    <pool>
                        <min-pool-size>2</min-pool-size>
                        <max-pool-size>70</max-pool-size>
                        <prefill>false</prefill>
                        <use-strict-min>false</use-strict-min>
                        <flush-strategy>FailingConnectionOnly</flush-strategy>
                    </pool>
                    <security>
                        <user-name>xxxxx</user-name>
                        <password>xxxxx</password>
                    </security>
                    <validation>
                        <check-valid-connection-sql>select 0</check-valid-connection-sql>
                    </validation>
                    <timeout>
                        <blocking-timeout-millis>120000</blocking-timeout-millis>
                        <idle-timeout-minutes>5</idle-timeout-minutes>
                    </timeout>
                </datasource>

      3. Add in test-vdb.xml java:/test_tables_pg configured in the previous step as a data source:

          <model name="test_dwh_pg">
        <property name="importer.useFullSchemaName" value="false"/>
        <property name="importer.tableTypes" value="TABLE,VIEW"/>
        <property name="importer.importKeys" value="false"/>
        <source name="test_dwh_pg" translator-name="myPg" connection-jndi-name="java:/test_dwh_pg"/>
    </model>

    <translator name="myPg" type="postgresql">
        <property name="SupportsNativeQueries" value="true"/>
    </translator>

      4. Run the following queries:

      --fails
select avg(cast(null as integer)) from "test_dwh_pg.test" ;;

--fails 
select sum(cast(null as integer)) from "test_dwh_pg.test" ;;
      Show
      1. In PostgreSQL create the test table using the following scripts: CREATE TABLE public .test ( expr1 integer ); 2. Add PostgreSQL database configuration in standalone-teiid.xml: <datasource jndi-name= "java:/test_dwh_pg" pool-name= "test_dwh_pg" enabled= "true" use-java-context= "true" > <connection-url> jdbc:postgresql://localhost:5432/test_dwh?charSet=utf8 </connection-url> <driver-class> org.postgresql.Driver </driver-class> <driver> org.postgresql </driver> <pool> <min-pool-size> 2 </min-pool-size> <max-pool-size> 70 </max-pool-size> <prefill> false </prefill> <use-strict-min> false </use-strict-min> <flush-strategy> FailingConnectionOnly </flush-strategy> </pool> <security> <user-name> xxxxx </user-name> <password> xxxxx </password> </security> <validation> <check-valid-connection-sql> select 0 </check-valid-connection-sql> </validation> <timeout> <blocking-timeout-millis> 120000 </blocking-timeout-millis> <idle-timeout-minutes> 5 </idle-timeout-minutes> </timeout> </datasource> 3. Add in test-vdb.xml java:/test_tables_pg configured in the previous step as a data source: <model name= "test_dwh_pg" > <property name= "importer.useFullSchemaName" value= "false" /> <property name= "importer.tableTypes" value= "TABLE,VIEW" /> <property name= "importer.importKeys" value= "false" /> <source name= "test_dwh_pg" translator-name= "myPg" connection-jndi-name= "java:/test_dwh_pg" /> </model> <translator name= "myPg" type= "postgresql" > <property name= "SupportsNativeQueries" value= "true" /> </translator> 4. Run the following queries: --fails select avg ( cast ( null as integer )) from "test_dwh_pg.test" ;; --fails select sum ( cast ( null as integer )) from "test_dwh_pg.test" ;;
    • Undefined

      Query with NULL will fail, as the cast statement is removed during the rewriting of the query.
      The issue also occurs for MSSQL:

      --fails
select avg(cast(null as integer)) from "test_dwh_pg.test" ;;

--fails 
select sum(cast(null as integer)) from "test_dwh_pg.test" ;;

              rhn-engineering-shawkins Steven Hawkins
              dalex005 Dmitrii Pogorelov
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                Created:
                Updated:
                Resolved: