Github user mattyb149 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/1407#discussion_r98684537
--- Diff:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/QueryDatabaseTable.java
---
@@ -212,9 +215,21 @@ public void onTrigger(final ProcessContext context,
final ProcessSessionFactory
final Map<String, String> statePropertyMap = new
HashMap<>(stateMap.toMap());
//If an initial max value for column(s) has been specified using
properties, and this column is not in the state manager, sync them to the state
property map
- for(final Map.Entry<String,String> maxProp :
maxValueProperties.entrySet()){
- if
(!statePropertyMap.containsKey(maxProp.getKey().toLowerCase())) {
- statePropertyMap.put(maxProp.getKey().toLowerCase(),
maxProp.getValue());
+ for (final Map.Entry<String, String> maxProp :
maxValueProperties.entrySet()) {
+ String maxPropKey = maxProp.getKey().toLowerCase();
+ String fullyQualifiedMaxPropKey = getStateKey(tableName,
maxPropKey);
+ if (!statePropertyMap.containsKey(fullyQualifiedMaxPropKey)) {
+ String newMaxPropValue;
+ // If we can't find the value at the fully-qualified key
name, it is possible (under a previous scheme)
+ // the value has been stored under a key that is only the
column name. Fall back to check the column name,
+ // but store the new initial max value under the
fully-qualified key.
+ if (statePropertyMap.containsKey(maxPropKey)) {
+ newMaxPropValue = statePropertyMap.get(maxPropKey);
+ } else {
+ newMaxPropValue = maxProp.getValue();
--- End diff --
I was trying to limit the number of queries GenerateTableFetch has to make,
since the real work will be done downstream. In this case, an invariant is
that a columnTypeMap entry exists iff a max-value entry exists. Otherwise the
first time I'll be doing a SELECT MAX(max-value-column) without a WHERE clause
(since there is no max-value entry) so I don't have to worry about type
conversions for literals. The type of the value(s) is the same as the type of
the MAX(values), so the first time I can fill both the columnType map and the
max-value map.
Is there a path where the current approach does not suffice? If so then I
can certainly add an extra query.
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