christinefeng commented on a change in pull request #616: PHOENIX-5432:
Refactor LiteralExpression to use the builder pattern
URL: https://github.com/apache/phoenix/pull/616#discussion_r347702011
##########
File path:
phoenix-core/src/main/java/org/apache/phoenix/expression/LiteralExpression.java
##########
@@ -57,181 +56,236 @@
private static final LiteralExpression[] NULL_EXPRESSIONS = new
LiteralExpression[Determinism.values().length];
private static final LiteralExpression[] TYPED_NULL_EXPRESSIONS = new
LiteralExpression[PDataType.values().length * Determinism.values().length];
private static final LiteralExpression[] BOOLEAN_EXPRESSIONS = new
LiteralExpression[2 * Determinism.values().length];
-
+
static {
for (Determinism determinism : Determinism.values()) {
- NULL_EXPRESSIONS[determinism.ordinal()] = new
LiteralExpression(null, determinism);
+ NULL_EXPRESSIONS[determinism.ordinal()] = new
LiteralExpression(null, null,
+ ByteUtil.EMPTY_BYTE_ARRAY, null, null,
SortOrder.getDefault(), determinism);
for (int i = 0; i < PDataType.values().length; i++) {
-
TYPED_NULL_EXPRESSIONS[i+PDataType.values().length*determinism.ordinal()] = new
LiteralExpression(PDataType.values()[i], determinism);
- }
- BOOLEAN_EXPRESSIONS[determinism.ordinal()] = new
LiteralExpression(Boolean.FALSE,
- PBoolean.INSTANCE, PBoolean.INSTANCE.toBytes(Boolean.FALSE),
determinism);
-
BOOLEAN_EXPRESSIONS[Determinism.values().length+determinism.ordinal()] = new
LiteralExpression(Boolean.TRUE, PBoolean.INSTANCE,
PBoolean.INSTANCE.toBytes(Boolean.TRUE), determinism);
+ PDataType type = PDataType.values()[i];
+
TYPED_NULL_EXPRESSIONS[i+PDataType.values().length*determinism.ordinal()] =
+ new LiteralExpression(null, type,
ByteUtil.EMPTY_BYTE_ARRAY,
+ !type.isFixedWidth() ? null :
type.getMaxLength(null), null,
+ SortOrder.getDefault(), determinism);
+ }
+ BOOLEAN_EXPRESSIONS[determinism.ordinal()] = new
LiteralExpression(Boolean.FALSE,
Review comment:
Using a Builder here has the potential of throwing an SQL Exception when the
build method attempts to derive the `value` field, which isn't necessary since
the value has already been provided.
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