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https://issues.apache.org/jira/browse/KYLIN-4757?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17195174#comment-17195174
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André Luís da Rosa de Lima commented on KYLIN-4757:
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Yeah it affects 3.1.0 and earlier versions I didn't notice that it was removed
in 4.0.0-alpha for now. I changed it to the correct version, sorry.
> Impossible precision for decimal datatype in kylin if the source column is
> numeric in postgres
> ----------------------------------------------------------------------------------------------
>
> Key: KYLIN-4757
> URL: https://issues.apache.org/jira/browse/KYLIN-4757
> Project: Kylin
> Issue Type: Bug
> Components: RDBMS Source
> Affects Versions: v3.1.0
> Reporter: André Luís da Rosa de Lima
> Priority: Major
> Labels: postgresql, source-jdbc
>
> Using Postgres as data source, columns of datatype numeric without a
> explicitly set precision and scale become "decimal(256)" in kylin. 256 comes
> from the value of "kylin.source.hive.default-varchar-precision" (despite
> using jdbc as datasource). This causes an error when building a cube.
> The problem can be fixed in
> "org.apache.kylin.source.jdbc.extensible.JdbcExplorer" class
> ([https://github.com/apache/kylin/blob/kylin-4.0.0-alpha/source-jdbc/src/main/java/org/apache/kylin/source/jdbc/extensible/JdbcExplorer.java#L111)]
> The csize variable defined in line 96 receives the value 131089 from
> columns.getInt("COLUMN_SIZE");
> I fixed it by modifying the following part in the source file starting after
> line 111:
> {code:java}
> int precision = (SqlUtil.isPrecisionApplicable(kylinType) && csize > 0) ?
> csize : -1;
> precision = Math.min(precision,
> KylinConfig.getInstanceFromEnv().getDefaultVarcharPrecision());
>
> int scale = (SqlUtil.isScaleApplicable(kylinType) && digits > 0) ? digits :
> -1;
> {code}
> to this:
>
> {code:java}
> int precision = (SqlUtil.isPrecisionApplicable(kylinType) && csize > 0) ?
> csize : -1;
> int maxPrecision = precision;
> if (kylinType.equals("char")) {
> maxPrecision = KylinConfig.getInstanceFromEnv().getDefaultCharPrecision();
> } else if (kylinType.equals("varchar")) {
> maxPrecision =
> KylinConfig.getInstanceFromEnv().getDefaultVarcharPrecision();
> } else if ((kylinType.equals("decimal") || kylinType.equals("numeric"))) {
> maxPrecision =
> KylinConfig.getInstanceFromEnv().getDefaultDecimalPrecision();
> }
> precision = Math.min(precision, maxPrecision);
> int scale = (SqlUtil.isScaleApplicable(kylinType) && digits > 0) ? digits :
> -1;
> {code}
>
>
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