public ExpressionAssembler(PlanContext planContext) {
this.planContext = planContext;
if (planContext instanceof ExplainPlanContext)
explainContext = ((ExplainPlanContext) planContext).getExplainContext();
else explainContext = null;
rulesContext = (SchemaRulesContext) planContext.getRulesContext();
registryService = rulesContext.getTypesRegistry();
queryContext = planContext.getQueryContext();
}
// Changes here probably need reflected in OnlineHelper#buildColumnDefault()
public TPreparedExpression assembleColumnDefault(Column column, TPreparedExpression expression) {
return PlanGenerator.generateDefaultExpression(
column,
expression,
registryService,
rulesContext.getTypesTranslator(),
planContext.getQueryContext());
}
@Override
public String generateResult() throws Exception {
StatementNode stmt = parser.parseStatement(sql);
binder.bind(stmt);
stmt = booleanNormalizer.normalize(stmt);
typeComputer.compute(stmt);
stmt = subqueryFlattener.flatten((DMLStatementNode) stmt);
// Turn parsed AST into intermediate form as starting point.
AST ast = new AST((DMLStatementNode) stmt, parser.getParameterList());
PlanContext plan = new PlanContext(rules, ast);
rules.applyRules(plan);
PlanNode.SummaryConfiguration configuration =
new PlanNode.SummaryConfiguration(
Boolean.parseBoolean(properties.getProperty("showRowTypes", "false")),
Boolean.parseBoolean(properties.getProperty("includeIndexTableNames", "false")));
String result = plan.planString(configuration);
if (Boolean.parseBoolean(properties.getProperty("showParameterTypes", "false")))
result = ast.formatParameterTypes() + result;
return result;
}
public ConstantExpression evalNow(PlanContext planContext, ExpressionNode node) {
if (node instanceof ConstantExpression) return (ConstantExpression) node;
TPreparedExpression expr = assembleExpression(node, null, null);
TPreptimeValue preptimeValue = expr.evaluateConstant(planContext.getQueryContext());
if (preptimeValue == null)
throw new AkibanInternalException("required constant expression: " + expr);
ValueSource valueSource = preptimeValue.value();
if (valueSource == null)
throw new AkibanInternalException("required constant expression: " + expr);
if (node instanceof ConditionExpression) {
Boolean value = valueSource.isNull() ? null : valueSource.getBoolean();
return new BooleanConstantExpression(value);
} else {
return new ConstantExpression(preptimeValue);
}
}
