[jira] [Created] (CALCITE-3864) Add Implementation for SqlLibraryOperators.CONCAT_FUNCTION in SqlFunctions and correct the return type inference of SqlLibraryOperators.CONCAT_FUNCTION

["TANG Wen-hui (Jira)" <ji...@apache.org>]

TANG Wen-hui created CALCITE-3864:
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             Summary: Add Implementation for SqlLibraryOperators.CONCAT_FUNCTION in SqlFunctions and correct the return type inference of SqlLibraryOperators.CONCAT_FUNCTION
                 Key: CALCITE-3864
                 URL: https://issues.apache.org/jira/browse/CALCITE-3864
             Project: Calcite
          Issue Type: Bug
            Reporter: TANG Wen-hui
            Assignee: TANG Wen-hui


Add the Implementation for SqlLibraryOperators.CONCAT_FUNCTION in SqlFunctions rather than register it as a kind of || operator in StandardConvertletTable, because it would be better for Jdbc adaptor to generate CONCAT for mysql rather than || operator, since CONCAT in mysql is not totally same as || operator.
And the return type inference of SqlLibraryOperators.CONCAT_FUNCTION will cause AssertionError when the precsion of its operands are not specified.

at org.apache.calcite.sql.type.SqlTypeFactoryImpl.createSqlType(SqlTypeFactoryImpl.java:64)at org.apache.calcite.sql.type.SqlTypeFactoryImpl.createSqlType(SqlTypeFactoryImpl.java:64) at org.apache.calcite.sql.fun.SqlLibraryOperators.lambda$static$1(SqlLibraryOperators.java:291) at org.apache.calcite.sql.type.SqlTypeTransformCascade.inferReturnType(SqlTypeTransformCascade.java:54) at org.apache.calcite.sql.SqlOperator.inferReturnType(SqlOperator.java:486) at org.apache.calcite.sql.SqlOperator.validateOperands(SqlOperator.java:453) at org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:321) at org.apache.calcite.sql.SqlFunction.deriveType(SqlFunction.java:218) at org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5858) at org.apache.calcite.sql.validate.SqlValidatorImpl$DeriveTypeVisitor.visit(SqlValidatorImpl.java:5845) at org.apache.calcite.sql.SqlCall.accept(SqlCall.java:139) at org.apache.calcite.sql.validate.SqlValidatorImpl.deriveTypeImpl(SqlValidatorImpl.java:1800) at org.apache.calcite.sql.validate.SqlValidatorImpl.deriveType(SqlValidatorImpl.java:1785) at org.apache.calcite.sql.SqlNode.validateExpr(SqlNode.java:260) at org.apache.calcite.sql.SqlOperator.validateCall(SqlOperator.java:423) at org.apache.calcite.sql.validate.SqlValidatorImpl.validateCall(SqlValidatorImpl.java:5552) at org.apache.calcite.sql.SqlCall.validate(SqlCall.java:116) at org.apache.calcite.sql.SqlNode.validateExpr(SqlNode.java:259) at org.apache.calcite.sql.SqlOperator.validateCall(SqlOperator.java:423) at org.apache.calcite.sql.validate.SqlValidatorImpl.validateCall(SqlValidatorImpl.java:5552) at org.apache.calcite.sql.SqlCall.validate(SqlCall.java:116) at org.apache.calcite.sql.validate.SqlValidatorImpl.validateScopedExpression(SqlValidatorImpl.java:1059) at org.apache.calcite.sql.validate.SqlValidatorImpl.validate(SqlValidatorImpl.java:766) at org.apache.calcite.sql.test.AbstractSqlTester.parseAndValidate(AbstractSqlTester.java:175) at org.apache.calcite.sql.test.AbstractSqlTester.getResultType(AbstractSqlTester.java:163) at org.apache.calcite.sql.test.AbstractSqlTester.getColumnType(AbstractSqlTester.java:155) at org.apache.calcite.sql.test.AbstractSqlTester.check(AbstractSqlTester.java:477) at org.apache.calcite.sql.test.SqlOperatorBaseTest$TesterImpl.check(SqlOperatorBaseTest.java:9489) at org.apache.calcite.sql.test.AbstractSqlTester.check(AbstractSqlTester.java:462) at org.apache.calcite.sql.test.AbstractSqlTester.checkString(AbstractSqlTester.java:447) at org.apache.calcite.sql.test.SqlOperatorBaseTest.testConcatOperator(SqlOperatorBaseTest.java:2184)



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