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提交 66d4ce58 authored 作者: Noel Grandin's avatar Noel Grandin
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enum for AggregateType

上级 426737dd
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正在显示 包含 152 行增加 和 148 行删除
h2/src/main/org/h2/command/Parser.java
浏览文件 @ 66d4ce58
...@@ -105,6 +105,7 @@ import org.h2.engine.User; ...@@ -105,6 +105,7 @@ import org.h2.engine.User;
import org.h2.engine.UserAggregate; import org.h2.engine.UserAggregate;
import org.h2.engine.UserDataType; import org.h2.engine.UserDataType;
import org.h2.expression.Aggregate; import org.h2.expression.Aggregate;
import org.h2.expression.Aggregate.AggregateType;
import org.h2.expression.Alias; import org.h2.expression.Alias;
import org.h2.expression.CompareLike; import org.h2.expression.CompareLike;
import org.h2.expression.Comparison; import org.h2.expression.Comparison;
...@@ -2610,34 +2611,34 @@ public class Parser { ...@@ -2610,34 +2611,34 @@ public class Parser {
} }
} }
private Expression readAggregate(int aggregateType, String aggregateName) { private Expression readAggregate(AggregateType aggregateType, String aggregateName) {
if (currentSelect == null) { if (currentSelect == null) {
throw getSyntaxError(); throw getSyntaxError();
} }
currentSelect.setGroupQuery(); currentSelect.setGroupQuery();
Expression r; Expression r;
if (aggregateType == Aggregate.COUNT) { if (aggregateType == AggregateType.COUNT) {
if (readIf("*")) { if (readIf("*")) {
r = new Aggregate(Aggregate.COUNT_ALL, null, currentSelect, r = new Aggregate(AggregateType.COUNT_ALL, null, currentSelect,
false); false);
} else { } else {
boolean distinct = readIf("DISTINCT"); boolean distinct = readIf("DISTINCT");
Expression on = readExpression(); Expression on = readExpression();
if (on instanceof Wildcard && !distinct) { if (on instanceof Wildcard && !distinct) {
// PostgreSQL compatibility: count(t.*) // PostgreSQL compatibility: count(t.*)
r = new Aggregate(Aggregate.COUNT_ALL, null, currentSelect, r = new Aggregate(AggregateType.COUNT_ALL, null, currentSelect,
false); false);
} else { } else {
r = new Aggregate(Aggregate.COUNT, on, currentSelect, r = new Aggregate(AggregateType.COUNT, on, currentSelect,
distinct); distinct);
} }
} }
} else if (aggregateType == Aggregate.GROUP_CONCAT) { } else if (aggregateType == AggregateType.GROUP_CONCAT) {
Aggregate agg = null; Aggregate agg = null;
boolean distinct = readIf("DISTINCT"); boolean distinct = readIf("DISTINCT");
if (equalsToken("GROUP_CONCAT", aggregateName)) { if (equalsToken("GROUP_CONCAT", aggregateName)) {
agg = new Aggregate(Aggregate.GROUP_CONCAT, agg = new Aggregate(AggregateType.GROUP_CONCAT,
readExpression(), currentSelect, distinct); readExpression(), currentSelect, distinct);
if (readIf("ORDER")) { if (readIf("ORDER")) {
read("BY"); read("BY");
...@@ -2649,7 +2650,7 @@ public class Parser { ...@@ -2649,7 +2650,7 @@ public class Parser {
} }
} else if (equalsToken("STRING_AGG", aggregateName)) { } else if (equalsToken("STRING_AGG", aggregateName)) {
// PostgreSQL compatibility: string_agg(expression, delimiter) // PostgreSQL compatibility: string_agg(expression, delimiter)
agg = new Aggregate(Aggregate.GROUP_CONCAT, agg = new Aggregate(AggregateType.GROUP_CONCAT,
readExpression(), currentSelect, distinct); readExpression(), currentSelect, distinct);
read(","); read(",");
agg.setGroupConcatSeparator(readExpression()); agg.setGroupConcatSeparator(readExpression());
...@@ -2721,7 +2722,7 @@ public class Parser { ...@@ -2721,7 +2722,7 @@ public class Parser {
return agg; return agg;
} }
private int getAggregateType(String name) { private AggregateType getAggregateType(String name) {
if (!identifiersToUpper) { if (!identifiersToUpper) {
// if not yet converted to uppercase, do it now // if not yet converted to uppercase, do it now
name = StringUtils.toUpperEnglish(name); name = StringUtils.toUpperEnglish(name);
...@@ -2733,8 +2734,8 @@ public class Parser { ...@@ -2733,8 +2734,8 @@ public class Parser {
if (schema != null) { if (schema != null) {
return readJavaFunction(schema, name); return readJavaFunction(schema, name);
} }
int agg = getAggregateType(name); AggregateType agg = getAggregateType(name);
if (agg >= 0) { if (agg != null) {
return readAggregate(agg, name); return readAggregate(agg, name);
} }
Function function = Function.getFunction(database, name); Function function = Function.getFunction(database, name);
...@@ -5026,7 +5027,7 @@ public class Parser { ...@@ -5026,7 +5027,7 @@ public class Parser {
command.setForce(force); command.setForce(force);
String name = readIdentifierWithSchema(); String name = readIdentifierWithSchema();
if (isKeyword(name) || Function.getFunction(database, name) != null || if (isKeyword(name) || Function.getFunction(database, name) != null ||
getAggregateType(name) >= 0) { getAggregateType(name) != null) {
throw DbException.get(ErrorCode.FUNCTION_ALIAS_ALREADY_EXISTS_1, throw DbException.get(ErrorCode.FUNCTION_ALIAS_ALREADY_EXISTS_1,
name); name);
} }
...@@ -5160,7 +5161,7 @@ public class Parser { ...@@ -5160,7 +5161,7 @@ public class Parser {
// fine // fine
} else if (isKeyword(aliasName) || } else if (isKeyword(aliasName) ||
Function.getFunction(database, aliasName) != null || Function.getFunction(database, aliasName) != null ||
getAggregateType(aliasName) >= 0) { getAggregateType(aliasName) != null) {
throw DbException.get(ErrorCode.FUNCTION_ALIAS_ALREADY_EXISTS_1, throw DbException.get(ErrorCode.FUNCTION_ALIAS_ALREADY_EXISTS_1,
aliasName); aliasName);
} }
......
h2/src/main/org/h2/expression/Aggregate.java
浏览文件 @ 66d4ce58
...@@ -39,94 +39,96 @@ import org.h2.value.ValueString; ...@@ -39,94 +39,96 @@ import org.h2.value.ValueString;
*/ */
public class Aggregate extends Expression { public class Aggregate extends Expression {
/** public enum AggregateType {
* The aggregate type for COUNT(*). /**
*/ * The aggregate type for COUNT(*).
public static final int COUNT_ALL = 0; */
COUNT_ALL,
/** /**
* The aggregate type for COUNT(expression). * The aggregate type for COUNT(expression).
*/ */
public static final int COUNT = 1; COUNT,
/** /**
* The aggregate type for GROUP_CONCAT(...). * The aggregate type for GROUP_CONCAT(...).
*/ */
public static final int GROUP_CONCAT = 2; GROUP_CONCAT,
/** /**
* The aggregate type for SUM(expression). * The aggregate type for SUM(expression).
*/ */
static final int SUM = 3; SUM,
/** /**
* The aggregate type for MIN(expression). * The aggregate type for MIN(expression).
*/ */
static final int MIN = 4; MIN,
/** /**
* The aggregate type for MAX(expression). * The aggregate type for MAX(expression).
*/ */
static final int MAX = 5; MAX,
/** /**
* The aggregate type for AVG(expression). * The aggregate type for AVG(expression).
*/ */
static final int AVG = 6; AVG,
/** /**
* The aggregate type for STDDEV_POP(expression). * The aggregate type for STDDEV_POP(expression).
*/ */
static final int STDDEV_POP = 7; STDDEV_POP,
/** /**
* The aggregate type for STDDEV_SAMP(expression). * The aggregate type for STDDEV_SAMP(expression).
*/ */
static final int STDDEV_SAMP = 8; STDDEV_SAMP,
/** /**
* The aggregate type for VAR_POP(expression). * The aggregate type for VAR_POP(expression).
*/ */
static final int VAR_POP = 9; VAR_POP,
/** /**
* The aggregate type for VAR_SAMP(expression). * The aggregate type for VAR_SAMP(expression).
*/ */
static final int VAR_SAMP = 10; VAR_SAMP,
/** /**
* The aggregate type for BOOL_OR(expression). * The aggregate type for BOOL_OR(expression).
*/ */
static final int BOOL_OR = 11; BOOL_OR,
/** /**
* The aggregate type for BOOL_AND(expression). * The aggregate type for BOOL_AND(expression).
*/ */
static final int BOOL_AND = 12; BOOL_AND,
/** /**
* The aggregate type for BOOL_OR(expression). * The aggregate type for BOOL_OR(expression).
*/ */
static final int BIT_OR = 13; BIT_OR,
/** /**
* The aggregate type for BOOL_AND(expression). * The aggregate type for BOOL_AND(expression).
*/ */
static final int BIT_AND = 14; BIT_AND,
/** /**
* The aggregate type for SELECTIVITY(expression). * The aggregate type for SELECTIVITY(expression).
*/ */
static final int SELECTIVITY = 15; SELECTIVITY,
/** /**
* The aggregate type for HISTOGRAM(expression). * The aggregate type for HISTOGRAM(expression).
*/ */
static final int HISTOGRAM = 16; HISTOGRAM
}
private static final HashMap<String, Integer> AGGREGATES = new HashMap<>(24); private static final HashMap<String, AggregateType> AGGREGATES = new HashMap<>(24);
private final int type; private final AggregateType type;
private final Select select; private final Select select;
private final boolean distinct; private final boolean distinct;
...@@ -147,7 +149,7 @@ public class Aggregate extends Expression { ...@@ -147,7 +149,7 @@ public class Aggregate extends Expression {
* @param select the select statement * @param select the select statement
* @param distinct if distinct is used * @param distinct if distinct is used
*/ */
public Aggregate(int type, Expression on, Select select, boolean distinct) { public Aggregate(AggregateType type, Expression on, Select select, boolean distinct) {
this.type = type; this.type = type;
this.on = on; this.on = on;
this.select = select; this.select = select;
...@@ -158,36 +160,36 @@ public class Aggregate extends Expression { ...@@ -158,36 +160,36 @@ public class Aggregate extends Expression {
/* /*
* Update initial size of AGGREGATES after editing the following list. * Update initial size of AGGREGATES after editing the following list.
*/ */
addAggregate("COUNT", COUNT); addAggregate("COUNT", AggregateType.COUNT);
addAggregate("SUM", SUM); addAggregate("SUM", AggregateType.SUM);
addAggregate("MIN", MIN); addAggregate("MIN", AggregateType.MIN);
addAggregate("MAX", MAX); addAggregate("MAX", AggregateType.MAX);
addAggregate("AVG", AVG); addAggregate("AVG", AggregateType.AVG);
addAggregate("GROUP_CONCAT", GROUP_CONCAT); addAggregate("GROUP_CONCAT", AggregateType.GROUP_CONCAT);
// PostgreSQL compatibility: string_agg(expression, delimiter) // PostgreSQL compatibility: string_agg(expression, delimiter)
addAggregate("STRING_AGG", GROUP_CONCAT); addAggregate("STRING_AGG", AggregateType.GROUP_CONCAT);
addAggregate("STDDEV_SAMP", STDDEV_SAMP); addAggregate("STDDEV_SAMP", AggregateType.STDDEV_SAMP);
addAggregate("STDDEV", STDDEV_SAMP); addAggregate("STDDEV", AggregateType.STDDEV_SAMP);
addAggregate("STDDEV_POP", STDDEV_POP); addAggregate("STDDEV_POP", AggregateType.STDDEV_POP);
addAggregate("STDDEVP", STDDEV_POP); addAggregate("STDDEVP", AggregateType.STDDEV_POP);
addAggregate("VAR_POP", VAR_POP); addAggregate("VAR_POP", AggregateType.VAR_POP);
addAggregate("VARP", VAR_POP); addAggregate("VARP", AggregateType.VAR_POP);
addAggregate("VAR_SAMP", VAR_SAMP); addAggregate("VAR_SAMP", AggregateType.VAR_SAMP);
addAggregate("VAR", VAR_SAMP); addAggregate("VAR", AggregateType.VAR_SAMP);
addAggregate("VARIANCE", VAR_SAMP); addAggregate("VARIANCE", AggregateType.VAR_SAMP);
addAggregate("BOOL_OR", BOOL_OR); addAggregate("BOOL_OR", AggregateType.BOOL_OR);
// HSQLDB compatibility, but conflicts with x > EVERY(...) // HSQLDB compatibility, but conflicts with x > EVERY(...)
addAggregate("SOME", BOOL_OR); addAggregate("SOME", AggregateType.BOOL_OR);
addAggregate("BOOL_AND", BOOL_AND); addAggregate("BOOL_AND", AggregateType.BOOL_AND);
// HSQLDB compatibility, but conflicts with x > SOME(...) // HSQLDB compatibility, but conflicts with x > SOME(...)
addAggregate("EVERY", BOOL_AND); addAggregate("EVERY", AggregateType.BOOL_AND);
addAggregate("SELECTIVITY", SELECTIVITY); addAggregate("SELECTIVITY", AggregateType.SELECTIVITY);
addAggregate("HISTOGRAM", HISTOGRAM); addAggregate("HISTOGRAM", AggregateType.HISTOGRAM);
addAggregate("BIT_OR", BIT_OR); addAggregate("BIT_OR", AggregateType.BIT_OR);
addAggregate("BIT_AND", BIT_AND); addAggregate("BIT_AND", AggregateType.BIT_AND);
} }
private static void addAggregate(String name, int type) { private static void addAggregate(String name, AggregateType type) {
AGGREGATES.put(name, type); AGGREGATES.put(name, type);
} }
...@@ -196,11 +198,10 @@ public class Aggregate extends Expression { ...@@ -196,11 +198,10 @@ public class Aggregate extends Expression {
* found. * found.
* *
* @param name the aggregate function name * @param name the aggregate function name
* @return -1 if no aggregate function has been found, or the aggregate type * @return null if no aggregate function has been found, or the aggregate type
*/ */
public static int getAggregateType(String name) { public static AggregateType getAggregateType(String name) {
Integer type = AGGREGATES.get(name); return AGGREGATES.get(name);
return type == null ? -1 : type.intValue();
} }
/** /**
...@@ -259,7 +260,7 @@ public class Aggregate extends Expression { ...@@ -259,7 +260,7 @@ public class Aggregate extends Expression {
group.put(this, data); group.put(this, data);
} }
Value v = on == null ? null : on.getValue(session); Value v = on == null ? null : on.getValue(session);
if (type == GROUP_CONCAT) { if (type == AggregateType.GROUP_CONCAT) {
if (v != ValueNull.INSTANCE) { if (v != ValueNull.INSTANCE) {
v = v.convertTo(Value.STRING); v = v.convertTo(Value.STRING);
if (groupConcatOrderList != null) { if (groupConcatOrderList != null) {
...@@ -287,7 +288,7 @@ public class Aggregate extends Expression { ...@@ -287,7 +288,7 @@ public class Aggregate extends Expression {
return ValueLong.get(table.getRowCount(session)); return ValueLong.get(table.getRowCount(session));
case MIN: case MIN:
case MAX: case MAX:
boolean first = type == MIN; boolean first = type == AggregateType.MIN;
Index index = getMinMaxColumnIndex(); Index index = getMinMaxColumnIndex();
int sortType = index.getIndexColumns()[0].sortType; int sortType = index.getIndexColumns()[0].sortType;
if ((sortType & SortOrder.DESCENDING) != 0) { if ((sortType & SortOrder.DESCENDING) != 0) {
...@@ -315,7 +316,7 @@ public class Aggregate extends Expression { ...@@ -315,7 +316,7 @@ public class Aggregate extends Expression {
data = AggregateData.create(type); data = AggregateData.create(type);
} }
Value v = data.getValue(session.getDatabase(), dataType, distinct); Value v = data.getValue(session.getDatabase(), dataType, distinct);
if (type == GROUP_CONCAT) { if (type == AggregateType.GROUP_CONCAT) {
ArrayList<Value> list = ((AggregateDataGroupConcat) data).getList(); ArrayList<Value> list = ((AggregateDataGroupConcat) data).getList();
if (list == null || list.size() == 0) { if (list == null || list.size() == 0) {
return ValueNull.INSTANCE; return ValueNull.INSTANCE;
......
h2/src/main/org/h2/expression/AggregateData.java
浏览文件 @ 66d4ce58
...@@ -6,6 +6,7 @@ ...@@ -6,6 +6,7 @@
package org.h2.expression; package org.h2.expression;
import org.h2.engine.Database; import org.h2.engine.Database;
import org.h2.expression.Aggregate.AggregateType;
import org.h2.value.Value; import org.h2.value.Value;
/** /**
...@@ -19,16 +20,16 @@ abstract class AggregateData { ...@@ -19,16 +20,16 @@ abstract class AggregateData {
* @param aggregateType the type of the aggregate operation * @param aggregateType the type of the aggregate operation
* @return the aggregate data object of the specified type * @return the aggregate data object of the specified type
*/ */
static AggregateData create(int aggregateType) { static AggregateData create(AggregateType aggregateType) {
if (aggregateType == Aggregate.SELECTIVITY) { if (aggregateType == AggregateType.SELECTIVITY) {
return new AggregateDataSelectivity(); return new AggregateDataSelectivity();
} else if (aggregateType == Aggregate.GROUP_CONCAT) { } else if (aggregateType == AggregateType.GROUP_CONCAT) {
return new AggregateDataGroupConcat(); return new AggregateDataGroupConcat();
} else if (aggregateType == Aggregate.COUNT_ALL) { } else if (aggregateType == AggregateType.COUNT_ALL) {
return new AggregateDataCountAll(); return new AggregateDataCountAll();
} else if (aggregateType == Aggregate.COUNT) { } else if (aggregateType == AggregateType.COUNT) {
return new AggregateDataCount(); return new AggregateDataCount();
} else if (aggregateType == Aggregate.HISTOGRAM) { } else if (aggregateType == AggregateType.HISTOGRAM) {
return new AggregateDataHistogram(); return new AggregateDataHistogram();
} else { } else {
return new AggregateDataDefault(aggregateType); return new AggregateDataDefault(aggregateType);
......
h2/src/main/org/h2/expression/AggregateDataDefault.java
浏览文件 @ 66d4ce58
...@@ -6,6 +6,7 @@ ...@@ -6,6 +6,7 @@
package org.h2.expression; package org.h2.expression;
import org.h2.engine.Database; import org.h2.engine.Database;
import org.h2.expression.Aggregate.AggregateType;
import org.h2.message.DbException; import org.h2.message.DbException;
import org.h2.util.ValueHashMap; import org.h2.util.ValueHashMap;
import org.h2.value.DataType; import org.h2.value.DataType;
...@@ -19,7 +20,7 @@ import org.h2.value.ValueNull; ...@@ -19,7 +20,7 @@ import org.h2.value.ValueNull;
* Data stored while calculating an aggregate. * Data stored while calculating an aggregate.
*/ */
class AggregateDataDefault extends AggregateData { class AggregateDataDefault extends AggregateData {
private final int aggregateType; private final AggregateType aggregateType;
private long count; private long count;
private ValueHashMap<AggregateDataDefault> distinctValues; private ValueHashMap<AggregateDataDefault> distinctValues;
private Value value; private Value value;
...@@ -28,7 +29,7 @@ class AggregateDataDefault extends AggregateData { ...@@ -28,7 +29,7 @@ class AggregateDataDefault extends AggregateData {
/** /**
* @param aggregateType the type of the aggregate operation * @param aggregateType the type of the aggregate operation
*/ */
AggregateDataDefault(int aggregateType) { AggregateDataDefault(AggregateType aggregateType) {
this.aggregateType = aggregateType; this.aggregateType = aggregateType;
} }
...@@ -46,7 +47,7 @@ class AggregateDataDefault extends AggregateData { ...@@ -46,7 +47,7 @@ class AggregateDataDefault extends AggregateData {
return; return;
} }
switch (aggregateType) { switch (aggregateType) {
case Aggregate.SUM: case SUM:
if (value == null) { if (value == null) {
value = v.convertTo(dataType); value = v.convertTo(dataType);
} else { } else {
...@@ -54,7 +55,7 @@ class AggregateDataDefault extends AggregateData { ...@@ -54,7 +55,7 @@ class AggregateDataDefault extends AggregateData {
value = value.add(v); value = value.add(v);
} }
break; break;
case Aggregate.AVG: case AVG:
if (value == null) { if (value == null) {
value = v.convertTo(DataType.getAddProofType(dataType)); value = v.convertTo(DataType.getAddProofType(dataType));
} else { } else {
...@@ -62,20 +63,20 @@ class AggregateDataDefault extends AggregateData { ...@@ -62,20 +63,20 @@ class AggregateDataDefault extends AggregateData {
value = value.add(v); value = value.add(v);
} }
break; break;
case Aggregate.MIN: case MIN:
if (value == null || database.compare(v, value) < 0) { if (value == null || database.compare(v, value) < 0) {
value = v; value = v;
} }
break; break;
case Aggregate.MAX: case MAX:
if (value == null || database.compare(v, value) > 0) { if (value == null || database.compare(v, value) > 0) {
value = v; value = v;
} }
break; break;
case Aggregate.STDDEV_POP: case STDDEV_POP:
case Aggregate.STDDEV_SAMP: case STDDEV_SAMP:
case Aggregate.VAR_POP: case VAR_POP:
case Aggregate.VAR_SAMP: { case VAR_SAMP: {
// Using Welford's method, see also // Using Welford's method, see also
// http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance // http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
// http://www.johndcook.com/standard_deviation.html // http://www.johndcook.com/standard_deviation.html
...@@ -90,7 +91,7 @@ class AggregateDataDefault extends AggregateData { ...@@ -90,7 +91,7 @@ class AggregateDataDefault extends AggregateData {
} }
break; break;
} }
case Aggregate.BOOL_AND: case BOOL_AND:
v = v.convertTo(Value.BOOLEAN); v = v.convertTo(Value.BOOLEAN);
if (value == null) { if (value == null) {
value = v; value = v;
...@@ -98,7 +99,7 @@ class AggregateDataDefault extends AggregateData { ...@@ -98,7 +99,7 @@ class AggregateDataDefault extends AggregateData {
value = ValueBoolean.get(value.getBoolean() && v.getBoolean()); value = ValueBoolean.get(value.getBoolean() && v.getBoolean());
} }
break; break;
case Aggregate.BOOL_OR: case BOOL_OR:
v = v.convertTo(Value.BOOLEAN); v = v.convertTo(Value.BOOLEAN);
if (value == null) { if (value == null) {
value = v; value = v;
...@@ -106,14 +107,14 @@ class AggregateDataDefault extends AggregateData { ...@@ -106,14 +107,14 @@ class AggregateDataDefault extends AggregateData {
value = ValueBoolean.get(value.getBoolean() || v.getBoolean()); value = ValueBoolean.get(value.getBoolean() || v.getBoolean());
} }
break; break;
case Aggregate.BIT_AND: case BIT_AND:
if (value == null) { if (value == null) {
value = v.convertTo(dataType); value = v.convertTo(dataType);
} else { } else {
value = ValueLong.get(value.getLong() & v.getLong()).convertTo(dataType); value = ValueLong.get(value.getLong() & v.getLong()).convertTo(dataType);
} }
break; break;
case Aggregate.BIT_OR: case BIT_OR:
if (value == null) { if (value == null) {
value = v.convertTo(dataType); value = v.convertTo(dataType);
} else { } else {
...@@ -133,42 +134,42 @@ class AggregateDataDefault extends AggregateData { ...@@ -133,42 +134,42 @@ class AggregateDataDefault extends AggregateData {
} }
Value v = null; Value v = null;
switch (aggregateType) { switch (aggregateType) {
case Aggregate.SUM: case SUM:
case Aggregate.MIN: case MIN:
case Aggregate.MAX: case MAX:
case Aggregate.BIT_OR: case BIT_OR:
case Aggregate.BIT_AND: case BIT_AND:
case Aggregate.BOOL_OR: case BOOL_OR:
case Aggregate.BOOL_AND: case BOOL_AND:
v = value; v = value;
break; break;
case Aggregate.AVG: case AVG:
if (value != null) { if (value != null) {
v = divide(value, count); v = divide(value, count);
} }
break; break;
case Aggregate.STDDEV_POP: { case STDDEV_POP: {
if (count < 1) { if (count < 1) {
return ValueNull.INSTANCE; return ValueNull.INSTANCE;
} }
v = ValueDouble.get(Math.sqrt(m2 / count)); v = ValueDouble.get(Math.sqrt(m2 / count));
break; break;
} }
case Aggregate.STDDEV_SAMP: { case STDDEV_SAMP: {
if (count < 2) { if (count < 2) {
return ValueNull.INSTANCE; return ValueNull.INSTANCE;
} }
v = ValueDouble.get(Math.sqrt(m2 / (count - 1))); v = ValueDouble.get(Math.sqrt(m2 / (count - 1)));
break; break;
} }
case Aggregate.VAR_POP: { case VAR_POP: {
if (count < 1) { if (count < 1) {
return ValueNull.INSTANCE; return ValueNull.INSTANCE;
} }
v = ValueDouble.get(m2 / count); v = ValueDouble.get(m2 / count);
break; break;
} }
case Aggregate.VAR_SAMP: { case VAR_SAMP: {
if (count < 2) { if (count < 2) {
return ValueNull.INSTANCE; return ValueNull.INSTANCE;
} }
......
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