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[Enhancement]Add session variable enable_compare_for_null to support compare null … #51201

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[Enhancement]Add session variable enable_compare_for_null to support compare null … #51201

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12 changes: 12 additions & 0 deletions fe/fe-core/src/main/java/com/starrocks/qe/SessionVariable.java
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Original file line number Diff line number Diff line change
Expand Up @@ -173,6 +173,7 @@ public class SessionVariable implements Serializable, Writable, Cloneable {
public static final String QUERY_CACHE_TYPE = "query_cache_type";
public static final String INTERACTIVE_TIMEOUT = "interactive_timeout";
public static final String WAIT_TIMEOUT = "wait_timeout";
public static final String ENABLE_COMPARE_FOR_NULL = "enable_compare_for_null";

public static final String CATALOG = "catalog";
public static final String NET_WRITE_TIMEOUT = "net_write_timeout";
Expand Down Expand Up @@ -1005,6 +1006,9 @@ public static MaterializedViewRewriteMode parse(String str) {
@VariableMgr.VarAttr(name = WAIT_TIMEOUT)
private int waitTimeout = 28800;

@VariableMgr.VarAttr(name = ENABLE_COMPARE_FOR_NULL)
private boolean enableCompareForNull = false;

// The number of seconds to wait for a block to be written to a connection before aborting the write
@VariableMgr.VarAttr(name = NET_WRITE_TIMEOUT)
private int netWriteTimeout = 60;
Expand Down Expand Up @@ -2610,6 +2614,14 @@ public int getWaitTimeoutS() {
return waitTimeout;
}

public boolean isEnableCompareForNull() {
return enableCompareForNull;
}

public void setEnableCompareForNull(boolean enableCompareForNull) {
this.enableCompareForNull = enableCompareForNull;
}

public long getSqlMode() {
return sqlMode;
}
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The most risky bug in this code is:
Serialization inconsistency due to missing enableCompareForNull field.

You can modify the code like this:

    @@ -173,6 +173,7 @@ public class SessionVariable implements Serializable, Writable, Cloneable {
     public static final String QUERY_CACHE_TYPE = "query_cache_type";
     public static final String INTERACTIVE_TIMEOUT = "interactive_timeout";
     public static final String WAIT_TIMEOUT = "wait_timeout";
+    public static final String ENABLE_COMPARE_FOR_NULL = "enable_compare_for_null";
 
     public static final String CATALOG = "catalog";
     public static final String NET_WRITE_TIMEOUT = "net_write_timeout";
@@ -1005,6 +1006,9 @@ public static MaterializedViewRewriteMode parse(String str) {
     @VariableMgr.VarAttr(name = WAIT_TIMEOUT)
     private int waitTimeout = 28800;
 
+    @VariableMgr.VarAttr(name = ENABLE_COMPARE_FOR_NULL)
+    private boolean enableCompareForNull = false;
+
     // The number of seconds to wait for a block to be written to a connection before aborting the write
     @VariableMgr.VarAttr(name = NET_WRITE_TIMEOUT)
     private int netWriteTimeout = 60;
@@ -2610,6 +2614,14 @@ public int getWaitTimeoutS() {
         return waitTimeout;
     }
 
+    public boolean isEnableCompareForNull() {
+        return enableCompareForNull;
+    }
+
+    public void setEnableCompareForNull(boolean enableCompareForNull) {
+        this.enableCompareForNull = enableCompareForNull;
+    }
+
     public long getSqlMode() {
         return sqlMode;
     }

+    /**
+     * Ensure that enableCompareForNull is serialized correctly.
+     */
+    private void writeObject(ObjectOutputStream out) throws IOException {
+        out.defaultWriteObject();
+        out.writeBoolean(enableCompareForNull);
+    }
+
+    /**
+     * Ensure that enableCompareForNull is deserialized correctly.
+     */
+    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
+        in.defaultReadObject();
+        enableCompareForNull = in.readBoolean();
+    }

Expand Down
7 changes: 6 additions & 1 deletion fe/fe-core/src/main/java/com/starrocks/sql/parser/AstBuilder.java
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Original file line number Diff line number Diff line change
Expand Up @@ -6119,7 +6119,12 @@ public ParseNode visitComparison(StarRocksParser.ComparisonContext context) {
private static BinaryType getComparisonOperator(Token symbol) {
switch (symbol.getType()) {
case StarRocksParser.EQ:
return BinaryType.EQ;
if (ConnectContext.get() != null && ConnectContext.get().getSessionVariable() != null
&& ConnectContext.get().getSessionVariable().isEnableCompareForNull()) {
return BinaryType.EQ_FOR_NULL;
} else {
return BinaryType.EQ;
}
case StarRocksParser.NEQ:
return BinaryType.NE;
case StarRocksParser.LT:
Expand Down
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