Method dumpSchema

src/org/apache/pig/PigServer.java:885–912

Write the schema for an alias to System.out. @param alias Alias whose schema will be written out @return Schema of alias dumped @throws IOException

(String alias)

     * @throws IOException
     */
    public Schema dumpSchema(String alias) throws IOException {
        try {
            pigContext.inDumpSchema = true;
            if ("@".equals(alias)) {
                alias = getLastRel();
            }
            LogicalRelationalOperator op = getOperatorForAlias( alias );
            LogicalSchema schema = op.getSchema();

            boolean pretty = "true".equals(pigContext.getProperties()
                                   .getProperty(PRETTY_PRINT_SCHEMA_PROPERTY));

            if (schema != null) {
                Schema s = org.apache.pig.newplan.logical.Util.translateSchema(schema);
                System.out.println(alias + ": " + (pretty ? s.prettyPrint() : s.toString()));
                return s;
            } else {
                System.out.println("Schema for " + alias + " unknown.");
                return null;
            }
        } catch (FrontendException fee) {
            int errCode = 1001;
            String msg = "Unable to describe schema for alias " + alias;
            throw new FrontendException (msg, errCode, PigException.INPUT, false, null, fee);
        } finally {
            pigContext.inDumpSchema = false;
        }
    }

    /**
     * Write the schema for a nestedAlias to System.out. Denoted by