Example - Analytics Database - Teradata Vantage

SQL External Routine Programming

Deployment
VantageCloud
VantageCore
Edition
Enterprise
IntelliFlex
VMware
Product
Analytics Database
Teradata Vantage
Release Number
17.20
Published
June 2022
Language
English (United States)
Last Update
2023-07-11
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iiv1628111441820.ditamap
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dita:id
B035-1147
lifecycle
latest
Product Category
Teradata Vantage™

In this example, FNC_CheckNullBitVector is called to check the value of element 2 after calling FNC_GetArrayElements.

void VerifyArrayLength ( ARRAY_HANDLE  *ary_handle,
                         char           sqlstate[6])
{
    NullBitVecType *NullBitVector;
    array_info_t arrayInfo;
    long nullVecBufSize;
    int presenceBit;
    bounds_t *arrayRange;
    bounds_t arrayScope[FNC_ARRAYMAXDIMENSIONS];
    index_t lastPresentElement;

    /* Call FNC_GetArrayTypeInfo first to find out the number of */
    /* elements in the array. */
    FNC_GetArrayTypeInfo(*ary_handle,
                         &arrayInfo,
                         arrayScope);
    (arrayInfo.totalNumElements % 8 == 0) ?
       (nullVecBufSize = arrayInfo.totalNumElements / 8) :
       (nullVecBufSize = arrayInfo.totalNumElements / 8) + 1;

    /* Allocate a new NullBitVector array. */
    NullBitVector = (NullBitVecType*)FNC_malloc(nullVecBufSize);

    /* Initialize the NullBitVector to default values. */
    memset(NullBitVector, 0, nullVecBufSize);
    arrayRange =
    (bounds_t*)FNC_malloc(sizeof(bounds_t)*arrayInfo.numDimensions);

    /* Set values of arrayRange to correspond to the range [1:2][1:2] */
    arrayRange[0].lowerBound = 1;
    arrayRange[0].upperBound = 2;
    arrayRange[1].lowerBound = 1;
    arrayRange[1].upperBound = 2;

    /* Get elements within the range [1:2][1:2] of myArray. */
    FNC_GetArrayElements(*ary_handle, arrayRange, &result, buffer,
       NullBitVector, &length);

    /* Check the presence bit for element [1][1] */
    presenceBit = FNC_CheckNullBitVector(NullBitVector, 1,
       nullVecBufSize);
    ...
}