Scaffolding for in-extension filtering

Supports IS NULL and IS NOT NULL checks

parquet/parquet_filter.h

@@ -0,0 +1,65 @@
+#ifndef PARQUET_FILTER_H
+#define PARQUET_FILTER_H
+
+#include <vector>
+#include <cstdint>
+
+enum ConstraintOperator {
+  Equal,
+  GreaterThan,
+  LessThanOrEqual,
+  LessThan,
+  GreaterThanOrEqual,
+  Match,
+  Like,
+  Glob,
+  Regexp,
+  NotEqual,
+  IsNot,
+  IsNotNull,
+  IsNull,
+  Is
+};
+
+enum ValueType {
+  Null,
+  Boolean,
+  Integer,
+  Double,
+  Blob,
+  Text
+};
+
+class Constraint {
+  int column; // underlying column in the query
+  ConstraintOperator op;
+  ValueType type;
+
+  bool boolValue;
+  uintptr_t intValue;
+  double doubleValue;
+  // Doubles as string value
+  std::vector<unsigned char> blobValue;
+
+public:
+  // Kind of a messy constructor function, but it's just for internal use, so whatever.
+  Constraint(
+    int column,
+    ConstraintOperator op,
+    ValueType type,
+    bool boolValue,
+    uintptr_t intValue,
+    double doubleValue,
+    std::vector<unsigned char> blobValue
+  );
+
+  int getColumn();
+  ConstraintOperator getOperator();
+  ValueType getType();
+  bool getBool();
+  uintptr_t getInt();
+  double getDouble();
+  std::vector<unsigned char> getBytes();
+};
+
+#endif