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Merged
kasiafi merged 2 commits into from
Jan 21, 2022
Merged

Follow the SQL standard in cast from double or real to varchar #10657

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1420a67
Fix cast from double to varchar: follow the SQL standard in formatting
kasiafi Dec 7, 2021
ce125d0
Fix cast from real to varchar: follow the SQL standard in formatting
kasiafi Jan 20, 2022
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30 changes: 28 additions & 2 deletions core/trino-main/src/main/java/io/trino/type/DoubleOperators.java
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,8 @@
import io.trino.spi.function.SqlType;
import io.trino.spi.type.StandardTypes;

import java.text.DecimalFormat;

import static com.google.common.base.Preconditions.checkState;
import static io.airlift.slice.Slices.utf8Slice;
import static io.trino.spi.StandardErrorCode.INVALID_CAST_ARGUMENT;
Expand Down Expand Up @@ -53,6 +55,8 @@ public final class DoubleOperators
private static final double MIN_BYTE_AS_DOUBLE = -0x1p7;
private static final double MAX_BYTE_PLUS_ONE_AS_DOUBLE = 0x1p7;

private static final ThreadLocal<DecimalFormat> FORMAT = ThreadLocal.withInitial(() -> new DecimalFormat("0.0###################E0"));

private DoubleOperators()
{
}
Expand Down Expand Up @@ -175,13 +179,35 @@ public static long castToReal(@SqlType(StandardTypes.DOUBLE) double value)
@SqlType("varchar(x)")
public static Slice castToVarchar(@LiteralParameter("x") long x, @SqlType(StandardTypes.DOUBLE) double value)
{
String stringValue = String.valueOf(value);
String stringValue;

// handle positive and negative 0
if (value == 0e0) {
if (1e0 / value > 0) {
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@findepi findepi Jan 20, 2022

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or, arguably more directly, Double.compare(0.0, value) == 0
the Double.compare sorts negative zero before positive zero

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@kasiafi kasiafi Jan 20, 2022

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I think it's clearer the way it is. Double.compare would require a comment.

stringValue = "0E0";
}
else {
stringValue = "-0E0";
}
}
else if (Double.isInfinite(value)) {
if (value > 0) {
stringValue = "Infinity";
}
else {
stringValue = "-Infinity";
}
}
else {
stringValue = FORMAT.get().format(value);
}

// String is all-ASCII, so String.length() here returns actual code points count
if (stringValue.length() <= x) {
return utf8Slice(stringValue);
}

throw new TrinoException(INVALID_CAST_ARGUMENT, format("Value %s cannot be represented as varchar(%s)", value, x));
throw new TrinoException(INVALID_CAST_ARGUMENT, format("Value %s (%s) cannot be represented as varchar(%s)", value, stringValue, x));
}

@ScalarOperator(SATURATED_FLOOR_CAST)
Expand Down
31 changes: 29 additions & 2 deletions core/trino-main/src/main/java/io/trino/type/RealOperators.java
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Expand Up @@ -25,6 +25,8 @@
import io.trino.spi.function.SqlType;
import io.trino.spi.type.StandardTypes;

import java.text.DecimalFormat;

import static io.airlift.slice.Slices.utf8Slice;
import static io.trino.spi.StandardErrorCode.INVALID_CAST_ARGUMENT;
import static io.trino.spi.StandardErrorCode.NUMERIC_VALUE_OUT_OF_RANGE;
Expand All @@ -49,6 +51,8 @@ public final class RealOperators
private static final float MIN_BYTE_AS_FLOAT = -0x1p7f;
private static final float MAX_BYTE_PLUS_ONE_AS_FLOAT = 0x1p7f;

private static final ThreadLocal<DecimalFormat> FORMAT = ThreadLocal.withInitial(() -> new DecimalFormat("0.0#####E0"));

private RealOperators()
{
}
Expand Down Expand Up @@ -100,13 +104,36 @@ public static long negate(@SqlType(StandardTypes.REAL) long value)
@SqlType("varchar(x)")
public static Slice castToVarchar(@LiteralParameter("x") long x, @SqlType(StandardTypes.REAL) long value)
{
String stringValue = String.valueOf(intBitsToFloat((int) value));
float floatValue = intBitsToFloat((int) value);
String stringValue;

// handle positive and negative 0
if (floatValue == 0.0f) {
if (1.0f / floatValue > 0) {
stringValue = "0E0";
}
else {
stringValue = "-0E0";
}
}
else if (Float.isInfinite(floatValue)) {
if (floatValue > 0) {
stringValue = "Infinity";
}
else {
stringValue = "-Infinity";
}
}
else {
stringValue = FORMAT.get().format(Double.parseDouble(Float.toString(floatValue)));
}

// String is all-ASCII, so String.length() here returns actual code points count
if (stringValue.length() <= x) {
return utf8Slice(stringValue);
}

throw new TrinoException(INVALID_CAST_ARGUMENT, format("Value %s cannot be represented as varchar(%s)", stringValue, x));
throw new TrinoException(INVALID_CAST_ARGUMENT, format("Value %s (%s) cannot be represented as varchar(%s)", floatValue, stringValue, x));
}

@ScalarOperator(CAST)
Expand Down
2 changes: 1 addition & 1 deletion core/trino-main/src/test/java/io/trino/operator/scalar/TestArrayTransformFunction.java
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Expand Up @@ -84,7 +84,7 @@ public void testTypeCombinations()
assertFunction("transform(ARRAY [25.6E0, 27.3E0], x -> CAST(x AS BIGINT))", new ArrayType(BIGINT), ImmutableList.of(26L, 27L));
assertFunction("transform(ARRAY [25.6E0, 27.3E0], x -> x + 1.0E0)", new ArrayType(DOUBLE), ImmutableList.of(26.6, 28.3));
assertFunction("transform(ARRAY [25.6E0, 27.3E0], x -> x = 25.6E0)", new ArrayType(BOOLEAN), ImmutableList.of(true, false));
assertFunction("transform(ARRAY [25.6E0, 27.3E0], x -> CAST(x AS VARCHAR))", new ArrayType(createUnboundedVarcharType()), ImmutableList.of("25.6", "27.3"));
assertFunction("transform(ARRAY [25.6E0, 27.3E0], x -> CAST(x AS VARCHAR))", new ArrayType(createUnboundedVarcharType()), ImmutableList.of("2.56E1", "2.73E1"));
assertFunction(
"transform(ARRAY [25.6E0, 27.3E0], x -> MAP(ARRAY[x + 1], ARRAY[true]))",
new ArrayType(mapType(DOUBLE, BOOLEAN)),
Expand Down
2 changes: 1 addition & 1 deletion core/trino-main/src/test/java/io/trino/operator/scalar/TestLambdaExpression.java
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Expand Up @@ -143,7 +143,7 @@ public void testTypeCombinations()
assertFunction("apply(25.6E0, x -> CAST(x AS BIGINT))", BIGINT, 26L);
assertFunction("apply(25.6E0, x -> x + 1.0E0)", DOUBLE, 26.6);
assertFunction("apply(25.6E0, x -> x = 25.6E0)", BOOLEAN, true);
assertFunction("apply(25.6E0, x -> CAST(x AS VARCHAR))", createUnboundedVarcharType(), "25.6");
assertFunction("apply(25.6E0, x -> CAST(x AS VARCHAR))", createUnboundedVarcharType(), "2.56E1");
assertFunction("apply(25.6E0, x -> MAP(ARRAY[x + 1], ARRAY[true]))", mapType(DOUBLE, BOOLEAN), ImmutableMap.of(26.6, true));

assertFunction("apply(true, x -> if(x, 25, 26))", INTEGER, 25);
Expand Down
4 changes: 2 additions & 2 deletions core/trino-main/src/test/java/io/trino/operator/scalar/TestMapTransformKeysFunction.java
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Expand Up @@ -160,11 +160,11 @@ public void testTypeCombinations()
assertFunction(
"transform_keys(map(ARRAY [25.5E0, 26.5E0, 27.5E0], ARRAY ['abc', 'def', 'xyz']), (k, v) -> CAST(k AS VARCHAR) || substr(v, 1, 1))",
mapType(VARCHAR, createVarcharType(3)),
ImmutableMap.of("25.5a", "abc", "26.5d", "def", "27.5x", "xyz"));
ImmutableMap.of("2.55E1a", "abc", "2.65E1d", "def", "2.75E1x", "xyz"));
assertFunction(
"transform_keys(map(ARRAY [25.5E0, 26.5E0], ARRAY [ARRAY ['a'], ARRAY ['b']]), (k, v) -> ARRAY [CAST(k AS VARCHAR)] || v)",
mapType(new ArrayType(VARCHAR), new ArrayType(createVarcharType(1))),
ImmutableMap.of(ImmutableList.of("25.5", "a"), ImmutableList.of("a"), ImmutableList.of("26.5", "b"), ImmutableList.of("b")));
ImmutableMap.of(ImmutableList.of("2.55E1", "a"), ImmutableList.of("a"), ImmutableList.of("2.65E1", "b"), ImmutableList.of("b")));

assertFunction(
"transform_keys(map(ARRAY [true, false], ARRAY [25, 26]), (k, v) -> if(k, 2 * v, 3 * v))",
Expand Down
4 changes: 2 additions & 2 deletions core/trino-main/src/test/java/io/trino/operator/scalar/TestMapTransformValuesFunction.java
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Expand Up @@ -102,7 +102,7 @@ public void testBasic()
assertFunction(
"transform_values(map(ARRAY[1, 2, 3], ARRAY [1.0E0, 1.4E0, 1.7E0]), (k, v) -> map(ARRAY[1, 2, 3], ARRAY['one', 'two', 'three'])[k] || '_' || CAST(v AS VARCHAR))",
mapType(INTEGER, VARCHAR),
ImmutableMap.of(1, "one_1.0", 2, "two_1.4", 3, "three_1.7"));
ImmutableMap.of(1, "one_1.0E0", 2, "two_1.4E0", 3, "three_1.7E0"));

assertFunction(
"transform_values(map(ARRAY[1, 2], ARRAY [TIMESTAMP '2020-05-10 12:34:56.123456789', TIMESTAMP '2010-05-10 12:34:56.123456789']), (k, v) -> date_add('year', 1, v))",
Expand Down Expand Up @@ -183,7 +183,7 @@ public void testTypeCombinations()
assertFunction(
"transform_values(map(ARRAY ['s0', 's1', 's2'], ARRAY [25.5E0, 26.5E0, 27.5E0]), (k, v) -> k || ':' || CAST(v as VARCHAR))",
mapType(createVarcharType(2), VARCHAR),
ImmutableMap.of("s0", "s0:25.5", "s1", "s1:26.5", "s2", "s2:27.5"));
ImmutableMap.of("s0", "s0:2.55E1", "s1", "s1:2.65E1", "s2", "s2:2.75E1"));
assertFunction(
"transform_values(map(ARRAY ['s0', 's2'], ARRAY [false, true]), (k, v) -> if(v, k, CAST(v AS VARCHAR)))",
mapType(createVarcharType(2), VARCHAR),
Expand Down
112 changes: 53 additions & 59 deletions core/trino-main/src/test/java/io/trino/sql/TestExpressionInterpreter.java
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Expand Up @@ -600,10 +600,10 @@ public void testCastToString()
assertOptimizedEquals("CAST(-12300000000 AS varchar)", "'-12300000000'");

// double
assertOptimizedEquals("CAST(123.0E0 AS varchar)", "'123.0'");
assertOptimizedEquals("CAST(-123.0E0 AS varchar)", "'-123.0'");
assertOptimizedEquals("CAST(123.456E0 AS varchar)", "'123.456'");
assertOptimizedEquals("CAST(-123.456E0 AS varchar)", "'-123.456'");
assertOptimizedEquals("CAST(123.0E0 AS varchar)", "'1.23E2'");
assertOptimizedEquals("CAST(-123.0E0 AS varchar)", "'-1.23E2'");
assertOptimizedEquals("CAST(123.456E0 AS varchar)", "'1.23456E2'");
assertOptimizedEquals("CAST(-123.456E0 AS varchar)", "'-1.23456E2'");

// boolean
assertOptimizedEquals("CAST(true AS varchar)", "'true'");
Expand Down Expand Up @@ -729,51 +729,48 @@ public void testCastDoubleToBoundedVarchar()
assertEvaluatedEquals("CAST(DOUBLE 'Infinity' AS varchar(8))", "'Infinity'");
assertEvaluatedEquals("CAST(DOUBLE 'Infinity' AS varchar(50))", "'Infinity'");

// incorrect behavior: the string representation is not compliant with the SQL standard
assertEvaluatedEquals("CAST(0e0 AS varchar(3))", "'0.0'");
assertEvaluatedEquals("CAST(DOUBLE '0' AS varchar(3))", "'0.0'");
assertEvaluatedEquals("CAST(DOUBLE '-0' AS varchar(4))", "'-0.0'");
assertEvaluatedEquals("CAST(DOUBLE '0' AS varchar(50))", "'0.0'");
assertEvaluatedEquals("CAST(0e0 AS varchar(3))", "'0E0'");
assertEvaluatedEquals("CAST(DOUBLE '0' AS varchar(3))", "'0E0'");
assertEvaluatedEquals("CAST(DOUBLE '-0' AS varchar(4))", "'-0E0'");
assertEvaluatedEquals("CAST(DOUBLE '0' AS varchar(50))", "'0E0'");

assertEvaluatedEquals("CAST(12e0 AS varchar(4))", "'12.0'");
assertEvaluatedEquals("CAST(12e2 AS varchar(6))", "'1200.0'");
assertEvaluatedEquals("CAST(12e-2 AS varchar(4))", "'0.12'");
assertEvaluatedEquals("CAST(12e0 AS varchar(5))", "'1.2E1'");
assertEvaluatedEquals("CAST(12e2 AS varchar(6))", "'1.2E3'");
assertEvaluatedEquals("CAST(12e-2 AS varchar(6))", "'1.2E-1'");

assertEvaluatedEquals("CAST(12e0 AS varchar(50))", "'12.0'");
assertEvaluatedEquals("CAST(12e2 AS varchar(50))", "'1200.0'");
assertEvaluatedEquals("CAST(12e-2 AS varchar(50))", "'0.12'");
assertEvaluatedEquals("CAST(12e0 AS varchar(50))", "'1.2E1'");
assertEvaluatedEquals("CAST(12e2 AS varchar(50))", "'1.2E3'");
assertEvaluatedEquals("CAST(12e-2 AS varchar(50))", "'1.2E-1'");

assertEvaluatedEquals("CAST(-12e0 AS varchar(5))", "'-12.0'");
assertEvaluatedEquals("CAST(-12e2 AS varchar(7))", "'-1200.0'");
assertEvaluatedEquals("CAST(-12e-2 AS varchar(5))", "'-0.12'");
assertEvaluatedEquals("CAST(-12e0 AS varchar(6))", "'-1.2E1'");
assertEvaluatedEquals("CAST(-12e2 AS varchar(6))", "'-1.2E3'");
assertEvaluatedEquals("CAST(-12e-2 AS varchar(7))", "'-1.2E-1'");

assertEvaluatedEquals("CAST(-12e0 AS varchar(50))", "'-12.0'");
assertEvaluatedEquals("CAST(-12e2 AS varchar(50))", "'-1200.0'");
assertEvaluatedEquals("CAST(-12e-2 AS varchar(50))", "'-0.12'");
assertEvaluatedEquals("CAST(-12e0 AS varchar(50))", "'-1.2E1'");
assertEvaluatedEquals("CAST(-12e2 AS varchar(50))", "'-1.2E3'");
assertEvaluatedEquals("CAST(-12e-2 AS varchar(50))", "'-1.2E-1'");

// the string representation is compliant with the SQL standard
assertEvaluatedEquals("CAST(12345678.9e0 AS varchar(12))", "'1.23456789E7'");
assertEvaluatedEquals("CAST(0.00001e0 AS varchar(6))", "'1.0E-5'");

// the result value does not fit in the type (also, it is not compliant with the SQL standard)
// the result value does not fit in the type
assertTrinoExceptionThrownBy(() -> evaluate("CAST(12e0 AS varchar(1))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value 12.0 cannot be represented as varchar(1)");
.hasMessage("Value 12.0 (1.2E1) cannot be represented as varchar(1)");
assertTrinoExceptionThrownBy(() -> evaluate("CAST(-12e2 AS varchar(1))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value -1200.0 cannot be represented as varchar(1)");
.hasMessage("Value -1200.0 (-1.2E3) cannot be represented as varchar(1)");
assertTrinoExceptionThrownBy(() -> evaluate("CAST(0e0 AS varchar(1))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value 0.0 cannot be represented as varchar(1)");
.hasMessage("Value 0.0 (0E0) cannot be represented as varchar(1)");
assertTrinoExceptionThrownBy(() -> evaluate("CAST(0e0 / 0e0 AS varchar(1))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value NaN cannot be represented as varchar(1)");
.hasMessage("Value NaN (NaN) cannot be represented as varchar(1)");
assertTrinoExceptionThrownBy(() -> evaluate("CAST(DOUBLE 'Infinity' AS varchar(1))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value Infinity cannot be represented as varchar(1)");
assertTrinoExceptionThrownBy(() -> evaluate("CAST(1200000e0 AS varchar(5))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value 1200000.0 cannot be represented as varchar(5)");
.hasMessage("Value Infinity (Infinity) cannot be represented as varchar(1)");

assertEvaluatedEquals("CAST(1200000e0 AS varchar(5))", "'1.2E6'");
}

@Test
Expand All @@ -787,50 +784,47 @@ public void testCastRealToBoundedVarchar()
assertEvaluatedEquals("CAST(REAL 'Infinity' AS varchar(8))", "'Infinity'");
assertEvaluatedEquals("CAST(REAL 'Infinity' AS varchar(50))", "'Infinity'");

// incorrect behavior: the string representation is not compliant with the SQL standard
assertEvaluatedEquals("CAST(REAL '0' AS varchar(3))", "'0.0'");
assertEvaluatedEquals("CAST(REAL '-0' AS varchar(4))", "'-0.0'");
assertEvaluatedEquals("CAST(REAL '0' AS varchar(50))", "'0.0'");
assertEvaluatedEquals("CAST(REAL '0' AS varchar(3))", "'0E0'");
assertEvaluatedEquals("CAST(REAL '-0' AS varchar(4))", "'-0E0'");
assertEvaluatedEquals("CAST(REAL '0' AS varchar(50))", "'0E0'");

assertEvaluatedEquals("CAST(REAL '12' AS varchar(4))", "'12.0'");
assertEvaluatedEquals("CAST(REAL '12e2' AS varchar(6))", "'1200.0'");
assertEvaluatedEquals("CAST(REAL '12e-2' AS varchar(4))", "'0.12'");
assertEvaluatedEquals("CAST(REAL '12' AS varchar(5))", "'1.2E1'");
assertEvaluatedEquals("CAST(REAL '12e2' AS varchar(5))", "'1.2E3'");
assertEvaluatedEquals("CAST(REAL '12e-2' AS varchar(6))", "'1.2E-1'");

assertEvaluatedEquals("CAST(REAL '12' AS varchar(50))", "'12.0'");
assertEvaluatedEquals("CAST(REAL '12e2' AS varchar(50))", "'1200.0'");
assertEvaluatedEquals("CAST(REAL '12e-2' AS varchar(50))", "'0.12'");
assertEvaluatedEquals("CAST(REAL '12' AS varchar(50))", "'1.2E1'");
assertEvaluatedEquals("CAST(REAL '12e2' AS varchar(50))", "'1.2E3'");
assertEvaluatedEquals("CAST(REAL '12e-2' AS varchar(50))", "'1.2E-1'");

assertEvaluatedEquals("CAST(REAL '-12' AS varchar(5))", "'-12.0'");
assertEvaluatedEquals("CAST(REAL '-12e2' AS varchar(7))", "'-1200.0'");
assertEvaluatedEquals("CAST(REAL '-12e-2' AS varchar(5))", "'-0.12'");
assertEvaluatedEquals("CAST(REAL '-12' AS varchar(6))", "'-1.2E1'");
assertEvaluatedEquals("CAST(REAL '-12e2' AS varchar(6))", "'-1.2E3'");
assertEvaluatedEquals("CAST(REAL '-12e-2' AS varchar(7))", "'-1.2E-1'");

assertEvaluatedEquals("CAST(REAL '-12' AS varchar(50))", "'-12.0'");
assertEvaluatedEquals("CAST(REAL '-12e2' AS varchar(50))", "'-1200.0'");
assertEvaluatedEquals("CAST(REAL '-12e-2' AS varchar(50))", "'-0.12'");
assertEvaluatedEquals("CAST(REAL '-12' AS varchar(50))", "'-1.2E1'");
assertEvaluatedEquals("CAST(REAL '-12e2' AS varchar(50))", "'-1.2E3'");
assertEvaluatedEquals("CAST(REAL '-12e-2' AS varchar(50))", "'-1.2E-1'");

// the string representation is compliant with the SQL standard
assertEvaluatedEquals("CAST(REAL '12345678.9e0' AS varchar(12))", "'1.2345679E7'");
assertEvaluatedEquals("CAST(REAL '0.00001e0' AS varchar(6))", "'1.0E-5'");
assertEvaluatedEquals("CAST(REAL '12345678.9e0' AS varchar(12))", "'1.234568E7'");
assertEvaluatedEquals("CAST(REAL '0.00001e0' AS varchar(12))", "'1.0E-5'");

// the result value does not fit in the type (also, it is not compliant with the SQL standard)
// the result value does not fit in the type
assertTrinoExceptionThrownBy(() -> evaluate("CAST(REAL '12' AS varchar(1))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value 12.0 cannot be represented as varchar(1)");
.hasMessage("Value 12.0 (1.2E1) cannot be represented as varchar(1)");
assertTrinoExceptionThrownBy(() -> evaluate("CAST(REAL '-12e2' AS varchar(1))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value -1200.0 cannot be represented as varchar(1)");
.hasMessage("Value -1200.0 (-1.2E3) cannot be represented as varchar(1)");
assertTrinoExceptionThrownBy(() -> evaluate("CAST(REAL '0' AS varchar(1))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value 0.0 cannot be represented as varchar(1)");
.hasMessage("Value 0.0 (0E0) cannot be represented as varchar(1)");
assertTrinoExceptionThrownBy(() -> evaluate("CAST(REAL '0e0' / REAL '0e0' AS varchar(1))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value NaN cannot be represented as varchar(1)");
.hasMessage("Value NaN (NaN) cannot be represented as varchar(1)");
assertTrinoExceptionThrownBy(() -> evaluate("CAST(REAL 'Infinity' AS varchar(1))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value Infinity cannot be represented as varchar(1)");
assertTrinoExceptionThrownBy(() -> evaluate("CAST(REAL '1200000' AS varchar(5))"))
.hasErrorCode(INVALID_CAST_ARGUMENT)
.hasMessage("Value 1200000.0 cannot be represented as varchar(5)");
.hasMessage("Value Infinity (Infinity) cannot be represented as varchar(1)");

assertEvaluatedEquals("CAST(REAL '1200000' AS varchar(5))", "'1.2E6'");
}

@Test
Expand Down
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