jodd-db/src/main/java/jodd/db/oom/sqlgen/chunks/SqlChunk.java
protected DbEntityDescriptor findColumnRef(final String columnRef) {
		DbEntityDescriptor ded = templateData.findTableDescriptorByColumnRef(columnRef);
		if (ded == null) {
			throw new DbSqlBuilderException("Invalid column reference: [" + columnRef + "]");
		}
		return ded;
	}
protected DbEntityDescriptor findColumnRef(final String columnRef) {
		DbEntityDescriptor ded = templateData.findTableDescriptorByColumnRef(columnRef);
		if (ded == null) {
			throw new DbSqlBuilderException("Invalid column reference: [" + columnRef + "]");
		}
		return ded;
	}
Finds a table that contains given column.