@Override
public void open() {
TAP_OPEN.in();
try {
if (isSkipBinding()) {
ValueSource value = bindings.getValue(skip());
if (!value.isNull()) this.skipLeft = value.getInt32();
} else {
this.skipLeft = skip();
}
if (skipLeft < 0) throw new NegativeLimitException("OFFSET", skipLeft);
if (isLimitBinding()) {
ValueSource value = bindings.getValue(limit());
if (value.isNull()) this.limitLeft = Integer.MAX_VALUE;
else {
TInstance type = MNumeric.INT.instance(true);
TExecutionContext executionContext = new TExecutionContext(null, type, context);
Value ivalue = new Value(MNumeric.INT.instance(true));
MNumeric.INT.fromObject(executionContext, value, ivalue);
this.limitLeft = ivalue.getInt32();
}
} else {
this.limitLeft = limit();
}
if (limitLeft < 0) throw new NegativeLimitException("LIMIT", limitLeft);
super.open();
} finally {
TAP_OPEN.out();
}
}
protected ValueSource valueNotNull(int index) {
try {
ValueSource value = bindings.getValue(index);
if (value.isNull()) return null;
else return value;
} catch (BindingNotSetException ex) {
return null;
}
}
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);
}
}
/**
* Encode the given value into a stream that can then be passed to <code>writeByteStream</code>.
*/
public ByteArrayOutputStream encodeValue(ValueSource value, ServerType type, boolean binary)
throws IOException {
if (value.isNull()) return null;
if ((zeroDateTimeBehavior != ZeroDateTimeBehavior.NONE)
&& (((type.getType().typeClass() == MDateAndTime.DATE) && (value.getInt32() == 0))
|| ((type.getType().typeClass() == MDateAndTime.DATETIME)
&& (value.getInt64() == 0)))) {
switch (zeroDateTimeBehavior) {
case EXCEPTION:
throw new ZeroDateTimeException();
case ROUND:
value =
(type.getType().typeClass() == MDateAndTime.DATETIME)
? ROUND_ZERO_DATETIME_SOURCE
: ROUND_ZERO_DATE_SOURCE;
break;
case CONVERT_TO_NULL:
return null;
}
}
reset();
appendValue(value, type, binary);
return getByteStream();
}
@Override
public void fromObject(TExecutionContext context, ValueSource in, ValueTarget out) {
if (in.isNull()) out.putNull();
else if (!tryFromObject(context, in, out)) parser.parse(context, in, out);
}
