JingsongLi commented on a change in pull request #10381: [FLINK-14513][hive]
Implement listPartitionsByFilter to HiveCatalog
URL: https://github.com/apache/flink/pull/10381#discussion_r355107686
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File path:
flink-connectors/flink-connector-hive/src/main/java/org/apache/flink/table/catalog/hive/util/HiveTableUtil.java
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@@ -175,4 +186,93 @@ public static boolean requireRelyConstraint(byte trait) {
return (trait & HIVE_CONSTRAINT_RELY) != 0;
}
+ /**
+ * Generates a filter string for partition columns from the given
filter expressions.
+ *
+ * @param numNonPartCol The number of non-partition columns -- used to
shift field reference index
+ * @param partColNames The names of all partition columns
+ * @param expressions The filter expressions in CNF form
+ * @return an Optional filter string equivalent to the expressions,
which is empty if the expressions can't be handled
+ */
+ public static Optional<String> makePartitionFilter(int numNonPartCol,
List<String> partColNames, List<Expression> expressions) {
+ List<String> filters = new ArrayList<>(expressions.size());
+ ExpressionExtractor extractor = new
ExpressionExtractor(numNonPartCol, partColNames);
+ for (Expression expression : expressions) {
+ String str = expression.accept(extractor);
+ if (str == null) {
+ return Optional.empty();
+ }
+ filters.add(str);
+ }
+ return Optional.of(String.join(" and ", filters));
+ }
+
+ private static class ExpressionExtractor implements
ExpressionVisitor<String> {
+
+ private static final Map<FunctionDefinition, String> funcToStr
= new HashMap<>();
Review comment:
checkstyle
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