snuyanzin commented on code in PR #79:
URL:
https://github.com/apache/flink-connector-jdbc/pull/79#discussion_r1443547398
##########
flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/table/ParameterizedPredicate.java:
##########
@@ -52,8 +69,26 @@ public void setPredicate(String predicate) {
}
public ParameterizedPredicate combine(String operator,
ParameterizedPredicate that) {
+ int paramIndex = String.format("(%s %s ", this.predicate,
operator).length();
+ if (!that.indexesOfPredicatePlaceHolders.isEmpty()) {
+ paramIndex = paramIndex +
that.indexesOfPredicatePlaceHolders.get(0);
+ }
+
this.predicate = String.format("(%s %s %s)", this.predicate, operator,
that.predicate);
this.parameters = ArrayUtils.addAll(this.parameters, that.parameters);
+
+ for (int i = 0; i < this.indexesOfPredicatePlaceHolders.size(); i++) {
+ // increment all the existing indexes to account for the new
additional first begin
+ // bracket
+ this.indexesOfPredicatePlaceHolders.set(
+ i, this.indexesOfPredicatePlaceHolders.get(i) + 1);
+ }
+ if (that.predicate.equals(
+
JdbcFilterPushdownPreparedStatementVisitor.PUSHDOWN_PREDICATE_PLACEHOLDER)
+ || (!that.indexesOfPredicatePlaceHolders.isEmpty())) {
+ // add index if that is a placeholder or has a placeholder.
+ this.indexesOfPredicatePlaceHolders.add(paramIndex);
+ }
Review Comment:
Also I tend to think that approach with indexes will not work because
between finding indexes and building `resolvedConditions` there is an optimizer
which could change SQL a bit
example of query where such change happens
```sql
"SELECT * FROM a left join d FOR SYSTEM_TIME AS OF a.proctime on ((d.age =
50 AND d.type = 0) OR (d.type = 1 AND d.age =40)) and a.ip = d.ip"
```
##########
flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/table/ParameterizedPredicate.java:
##########
@@ -52,8 +69,26 @@ public void setPredicate(String predicate) {
}
public ParameterizedPredicate combine(String operator,
ParameterizedPredicate that) {
+ int paramIndex = String.format("(%s %s ", this.predicate,
operator).length();
+ if (!that.indexesOfPredicatePlaceHolders.isEmpty()) {
+ paramIndex = paramIndex +
that.indexesOfPredicatePlaceHolders.get(0);
+ }
+
this.predicate = String.format("(%s %s %s)", this.predicate, operator,
that.predicate);
this.parameters = ArrayUtils.addAll(this.parameters, that.parameters);
+
+ for (int i = 0; i < this.indexesOfPredicatePlaceHolders.size(); i++) {
+ // increment all the existing indexes to account for the new
additional first begin
+ // bracket
+ this.indexesOfPredicatePlaceHolders.set(
+ i, this.indexesOfPredicatePlaceHolders.get(i) + 1);
+ }
+ if (that.predicate.equals(
+
JdbcFilterPushdownPreparedStatementVisitor.PUSHDOWN_PREDICATE_PLACEHOLDER)
+ || (!that.indexesOfPredicatePlaceHolders.isEmpty())) {
+ // add index if that is a placeholder or has a placeholder.
+ this.indexesOfPredicatePlaceHolders.add(paramIndex);
+ }
Review Comment:
Also I tend to think that approach with indexes will not work because
between finding indexes and building `resolvedConditions` there is an optimizer
which could change SQL a bit
example of query where such change happens
```sql
SELECT * FROM a left join d FOR SYSTEM_TIME AS OF a.proctime on ((d.age = 50
AND d.type = 0) OR (d.type = 1 AND d.age =40)) and a.ip = d.ip;
```
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