tkhurana commented on code in PR #2239:
URL: https://github.com/apache/phoenix/pull/2239#discussion_r2241075085
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phoenix-core-client/src/main/java/org/apache/phoenix/compile/WhereOptimizer.java:
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@@ -1945,6 +1948,150 @@ public KeySlots visitLeave(InListExpression node,
List<KeySlots> childParts) {
return newKeyParts(childSlot, node, new ArrayList<KeyRange>(ranges));
}
+ /**
+ * If {@link ArrayAnyComparisonExpression} is of the form:
+ *
+ * <pre>
+ * COL = ANY(ARR)
+ * </pre>
+ *
+ * then we can extract the scan ranges for the COL, given COL is a PK
column. This syntactical
+ * pattern can be used as a replacement for a IN expression. So, instead
of following IN
+ * expression:
+ *
+ * <pre>
+ * COL IN (VAL1, VAL2, ... VALN)
+ * </pre>
+ *
+ * we can use the following ANY expression:
+ *
+ * <pre>
+ * try (Connection conn = DriverManager.getConnection(url)) {
+ * conn.createArrayOf("CHAR", new String[] {"VAL1", "VAL2", ...
"VALN"});
+ * try (PreparedStatement stmt = conn.prepareStatement(
+ * "SELECT ... FROM TABLE WHERE COL = ANY(?)")) {
+ * stmt.setArray(1, arr);
+ * ResultSet rs = stmt.executeQuery();
+ * }
+ * }
+ * </pre>
+ *
+ * This will help in saving the query parsing time as on using IN list
query parsing time
+ * increases with the size of IN list but in case of ANY expression it is
constant. Below we
+ * account for cases where COL is on the LHS or RHS of the comparison
expression.
+ * @param node {@link ArrayAnyComparisonExpression} node for
which scan ranges are to
+ * be extracted
+ * @param keyExpressions {@link RowKeyColumnExpression} for the PK column
for which scan ranges
+ * are to be extracted
+ * @return true if the scan ranges can be extracted, false otherwise
+ */
+ private boolean
prepareForArrayAnyComparisonKeySlots(ArrayAnyComparisonExpression node,
+ List<Expression> keyExpressions) {
+ // {@link ArrayAnyComparisonExpression} has two children, and the second
child is
+ // comparison expression
+ Expression childExpr = node.getChildren().get(1);
+ if (!(childExpr instanceof ComparisonExpression)) {
+ return false;
+ }
+ ComparisonExpression comparisonExpr = (ComparisonExpression) childExpr;
+
+ // Replacing IN() with =ANY() is only valid if the comparison operator
is EQUAL
+ if (comparisonExpr.getFilterOp() != CompareOperator.EQUAL) {
+ return false;
+ }
+
+ // {@link ComparisonExpression} will have two children in this case, we
need to make
+ // sure that one of them is a {@link RowKeyColumnExpression} and the
other is a {@link
+ // ArrayElemRefExpression}. Further, the first child of {@link
ArrayElemRefExpression}
+ // must be a {@link LiteralExpression}. The first child of {@link
+ // ArrayElemRefExpression} is same as the first child of {@link
+ // ArrayAnyComparisonExpression}.
+ Expression lhs = comparisonExpr.getChildren().get(0);
+ Expression rhs = comparisonExpr.getChildren().get(1);
+ if (lhs instanceof RowKeyColumnExpression && rhs instanceof
ArrayElemRefExpression) {
Review Comment:
What if the RowKeyColumnExpression is embedded inside another expression
like CoerceExpression. That should not have any impact on the scan range
generated.
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