morrySnow commented on code in PR #32225:
URL: https://github.com/apache/doris/pull/32225#discussion_r1524339901
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/CascadesContext.java:
##########
@@ -127,6 +128,11 @@ public class CascadesContext implements ScheduleContext {
private boolean isLeadingDisableJoinReorder = false;
+ // keep track of which element_at function's level
+ // e.g. element_at(element_at(v, 'repo'), 'name') level 1
+ // element_at(v, 'repo') level 2
+ private int currentElementAtLevel = 0;
Review Comment:
how to support more than one element at in plan?
##########
fe/fe-core/src/main/java/org/apache/doris/analysis/BinaryPredicate.java:
##########
@@ -492,17 +492,27 @@ private Type getCmpType() throws AnalysisException {
}
}
- if ((t1.isDecimalV3Type() && !t2.isStringType() &&
!t2.isFloatingPointType())
- || (t2.isDecimalV3Type() && !t1.isStringType() &&
!t1.isFloatingPointType())) {
+ if ((t1.isDecimalV3Type() && !t2.isStringType() &&
!t2.isFloatingPointType() && !t2.isVariantType())
+ || (t2.isDecimalV3Type() && !t1.isStringType() &&
!t1.isFloatingPointType() && !t1.isVariantType())) {
return Type.getAssignmentCompatibleType(getChild(0).getType(),
getChild(1).getType(), false,
SessionVariable.getEnableDecimal256());
}
// Variant can be implicit cast to numeric type and string type at
present
if (t1.isVariantType() && (t2.isNumericType() || t2.isStringType())) {
+ if (t2.isDecimalV2Type() || t2.isDecimalV3Type()) {
+ // TODO support decimal
+ throw new
org.apache.doris.nereids.exceptions.AnalysisException("Not support cast to
decimal type"
+ + " at present, maybe explicitly cast variant to
double");
+ }
return Type.fromPrimitiveType(t2);
}
if (t2.isVariantType() && (t1.isNumericType() || t1.isStringType())) {
+ if (t1.isDecimalV2Type() || t1.isDecimalV3Type()) {
+ // TODO support decimal
+ throw new
org.apache.doris.nereids.exceptions.AnalysisException("Not support cast to
decimal type"
+ + " at present, maybe explicitly cast variant to
double");
+ }
Review Comment:
implicit cast to double is better?
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/FunctionBinder.java:
##########
@@ -188,6 +191,15 @@ public Expression visitUnboundFunction(UnboundFunction
unboundFunction, Expressi
// so wrap COUNT with Nvl to ensure it's result is 0 instead
of null to get the correct result
boundFunction = new Nvl(boundFunction, new BigIntLiteral(0));
}
+ if (context.cascadesContext.currentElementAtLevel() == 1
Review Comment:
it is hard to understand, please add enough comment to explain the if
condition
##########
fe/fe-core/src/main/java/org/apache/doris/analysis/BinaryPredicate.java:
##########
@@ -492,17 +492,27 @@ private Type getCmpType() throws AnalysisException {
}
}
- if ((t1.isDecimalV3Type() && !t2.isStringType() &&
!t2.isFloatingPointType())
- || (t2.isDecimalV3Type() && !t1.isStringType() &&
!t1.isFloatingPointType())) {
+ if ((t1.isDecimalV3Type() && !t2.isStringType() &&
!t2.isFloatingPointType() && !t2.isVariantType())
+ || (t2.isDecimalV3Type() && !t1.isStringType() &&
!t1.isFloatingPointType() && !t1.isVariantType())) {
return Type.getAssignmentCompatibleType(getChild(0).getType(),
getChild(1).getType(), false,
SessionVariable.getEnableDecimal256());
}
// Variant can be implicit cast to numeric type and string type at
present
if (t1.isVariantType() && (t2.isNumericType() || t2.isStringType())) {
+ if (t2.isDecimalV2Type() || t2.isDecimalV3Type()) {
+ // TODO support decimal
+ throw new
org.apache.doris.nereids.exceptions.AnalysisException("Not support cast to
decimal type"
Review Comment:
use `org.apache.doris.common.AnalysisException` here
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/FunctionBinder.java:
##########
@@ -141,6 +141,9 @@ private UnboundFunction
bindHighOrderFunction(UnboundFunction unboundFunction, E
@Override
public Expression visitUnboundFunction(UnboundFunction unboundFunction,
ExpressionRewriteContext context) {
+ if (unboundFunction.getName().equalsIgnoreCase("element_at")) {
Review Comment:
it could not work correctly when user craate a UDF named element_at under
database.
##########
fe/fe-core/src/main/java/org/apache/doris/nereids/rules/expression/rules/FunctionBinder.java:
##########
@@ -188,6 +191,15 @@ public Expression visitUnboundFunction(UnboundFunction
unboundFunction, Expressi
// so wrap COUNT with Nvl to ensure it's result is 0 instead
of null to get the correct result
boundFunction = new Nvl(boundFunction, new BigIntLiteral(0));
}
+ if (context.cascadesContext.currentElementAtLevel() == 1
+ &&
PushDownToProjectionFunction.validToPushDown(boundFunction)) {
+ // Only rewrite the top level of PushDownToProjectionFunction,
otherwise invalid slot will be generated
+ context.cascadesContext.resetCurrentElementAtLevel();
Review Comment:
does it could work well for expression such as `element_at(v1,
cast(element_at(v2, 'a') as int) + cast(element_at(v3, 'b') as bigint))`?
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