/**
* @param paramsById
* @param exprNode
* @return
*/
private static AbstractExpression parseValueExpression(
HashMap<Long, Integer> paramsById, VoltXMLElement exprNode) {
String type = exprNode.attributes.get("valuetype");
String isParam = exprNode.attributes.get("isparam");
String isPlannerGenerated = exprNode.attributes.get("isplannergenerated");
VoltType vt = VoltType.typeFromString(type);
int size = VoltType.MAX_VALUE_LENGTH;
assert (vt != VoltType.VOLTTABLE);
if ((vt != VoltType.STRING) && (vt != VoltType.VARBINARY)) {
if (vt == VoltType.NULL) size = 0;
else size = vt.getLengthInBytesForFixedTypes();
}
// A ParameterValueExpression is needed to represent any user-provided or planner-injected
// parameter.
boolean needParameter = (isParam != null) && (isParam.equalsIgnoreCase("true"));
// A ConstantValueExpression is needed to represent a constant in the statement,
// EVEN if that constant has been "parameterized" by the plan caching code.
ConstantValueExpression cve = null;
boolean needConstant =
(needParameter == false)
|| ((isPlannerGenerated != null) && (isPlannerGenerated.equalsIgnoreCase("true")));
if (needConstant) {
cve = new ConstantValueExpression();
cve.setValueType(vt);
cve.setValueSize(size);
if (!needParameter && vt != VoltType.NULL) {
String valueStr = exprNode.attributes.get("value");
cve.setValue(valueStr);
}
}
if (needParameter) {
ParameterValueExpression expr = new ParameterValueExpression();
long id = Long.parseLong(exprNode.attributes.get("id"));
int paramIndex = paramIndexById(paramsById, id);
expr.setValueType(vt);
expr.setValueSize(size);
expr.setParameterIndex(paramIndex);
if (needConstant) {
expr.setOriginalValue(cve);
}
return expr;
}
return cve;
}
// test that if someone provides their own inline projection
// that the output schema of the scan node consists of the output
// schema of the projection. Updates will do this so that the
// inlined projection fills the values of the output tuples correctly
// before it attempts to update them
public void testOutputSchemaOverriddenProjection() {
AbstractScanPlanNode dut = new SeqScanPlanNode();
dut.setTargetTableName(TABLE1);
// Create an output schema like we might see for an inlined projection
// generated for update. We'll have 4 output columns, the first will
// be the tuple address, the second one a parameter expression, next
// will be a constant, and the other will be a more complex expression
// that uses some TVEs.
NodeSchema proj_schema = new NodeSchema();
String[] cols = new String[4];
TupleAddressExpression col1_exp = new TupleAddressExpression();
proj_schema.addColumn(new SchemaColumn("", "tuple_address", "tuple_address", col1_exp));
cols[0] = "tuple_address";
// update column 1 with a parameter value
ParameterValueExpression col2_exp = new ParameterValueExpression();
col2_exp.setParameterIndex(0);
col2_exp.setValueType(COLTYPES[1]);
col2_exp.setValueSize(COLTYPES[1].getLengthInBytesForFixedTypes());
// XXX I'm not sure what to do with the name for the updated column yet.
// I think it should be an alias and not the original table name/col name
proj_schema.addColumn(new SchemaColumn(TABLE1, COLS[1], COLS[1], col2_exp));
cols[1] = COLS[1];
// Update column 3 with a constant value
ConstantValueExpression col3_exp = new ConstantValueExpression();
col3_exp.setValueType(COLTYPES[3]);
col3_exp.setValueSize(COLTYPES[3].getLengthInBytesForFixedTypes());
col3_exp.setValue("3.14159");
proj_schema.addColumn(new SchemaColumn(TABLE1, COLS[3], COLS[3], col3_exp));
cols[2] = COLS[3];
// update column 4 with a sum of columns 0 and 2
OperatorExpression col4_exp = new OperatorExpression();
col4_exp.setValueType(COLTYPES[4]);
col4_exp.setValueSize(COLTYPES[4].getLengthInBytesForFixedTypes());
col4_exp.setExpressionType(ExpressionType.OPERATOR_PLUS);
TupleValueExpression left = new TupleValueExpression();
left.setTableName(TABLE1);
left.setColumnName(COLS[0]);
left.setColumnAlias(COLS[0]);
left.setValueType(COLTYPES[0]);
left.setValueSize(COLTYPES[0].getLengthInBytesForFixedTypes());
TupleValueExpression right = new TupleValueExpression();
right.setTableName(TABLE1);
right.setColumnName(COLS[2]);
right.setColumnAlias(COLS[2]);
right.setValueType(COLTYPES[2]);
right.setValueSize(COLTYPES[2].getLengthInBytesForFixedTypes());
col4_exp.setLeft(left);
col4_exp.setRight(right);
proj_schema.addColumn(new SchemaColumn(TABLE1, COLS[4], "C1", col4_exp));
cols[3] = COLS[4];
ProjectionPlanNode proj_node = new ProjectionPlanNode();
proj_node.setOutputSchema(proj_schema);
dut.addInlinePlanNode(proj_node);
System.out.println("ProjSchema: " + proj_schema.toString());
dut.generateOutputSchema(m_voltdb.getDatabase());
NodeSchema dut_schema = dut.getOutputSchema();
System.out.println(dut_schema.toString());
for (int i = 0; i < cols.length; i++) {
SchemaColumn col = null;
if (i == 0) {
col = dut_schema.find("", cols[i], cols[i]);
} else {
col = dut_schema.find(TABLE1, cols[i], cols[i]);
}
assertNotNull(col);
assertEquals(col.getExpression().getExpressionType(), ExpressionType.VALUE_TUPLE);
}
}