Conceded. let's discuss it tomorrow. I'll sleep on it (and Stackoverflow-it) in the meantime.

Best, Dimitar

On 2015-Oct-21, at 15:47, Sjoerd Mullender sjoerd@acm.org wrote:

On 21/10/15 15:32, Dimitar Nedev wrote:

...

I *need* to map it to a (primitive) type in Java. I can keep creating my own types but nobody's gonna know what to do with them. The expected behaviour should be the same as with JDBC.

Be that as it may, you can still not use long. If the C type that you get from Java really is long, you need to use C preprocessor conditionals to distinguish between int (4 bytes) and lng (8 bytes). You can not cast the result of Tloc() to (long *). Period. You can depend on float being equal to flt, and double being equal to dbl. You have to make some sort of mapping between the native Java types and the MonetDB types. But that does not involve long on the MonetDB side of things.

...

Best, Dimitar

...

On 2015-Oct-21, at 15:27, Sjoerd Mullender sjoerd@acm.org wrote:

Columns do not contain values of type short, long, float or double. They might contain values of type sht, lng, flt and dbl. You should not use type long in your code unless an external API requires it. Long is not portable since it can be either 32 or 64 bits, even on a 64 bit architecture. A good rule is, if you created a BAT with a TYPE_xxx, use xxx as the name of the C type.

On 21/10/15 14:55, Dimitar Nedev wrote:

...

Changeset: bf487cfa489a for MonetDB URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=bf487cfa489a Modified Files: java/embedded/org_monetdb_embedded_result_EmbeddedQueryResult.c Branch: embedded-java Log Message:

Fix miltiple column type cast

diffs (90 lines):

diff --git a/java/embedded/org_monetdb_embedded_result_EmbeddedQueryResult.c b/java/embedded/org_monetdb_embedded_result_EmbeddedQueryResult.c --- a/java/embedded/org_monetdb_embedded_result_EmbeddedQueryResult.c +++ b/java/embedded/org_monetdb_embedded_result_EmbeddedQueryResult.c @@ -29,18 +29,18 @@ static jobject getBooleanColumn(JNIEnv * jboolean nul_tmp[size]; if (b->T->nonil && !b->T->nil) { for (i = 0; i < size; i++) {

• 	val_tmp[i] = (jboolean) ((jboolean*) Tloc(b, BUNfirst(b)))[i];
  

• 	val_tmp[i] = (bit) ((bit*) Tloc(b, BUNfirst(b)))[i];
  nul_tmp[i] = false;
  

  } } else { for (i = 0; i < size; i++) {

• 	int v = ((jboolean*) Tloc(b, BUNfirst(b)))[i];
  

• 	int v = ((bit*) Tloc(b, BUNfirst(b)))[i];
  if (v == bit_nil) {
  	val_tmp[i] = 0;
  	nul_tmp[i] = true;
  } else {
  

• 		val_tmp[i] = (jboolean)v;
  

• 		val_tmp[i] = (bit)v;
  	nul_tmp[i] = false;
  }
  

  }

@@ -78,7 +78,7 @@ static jobject getByteColumn(JNIEnv *env } else { for (i = 0; i < size; i++) {

• 	int v = ((bte*) Tloc(b, BUNfirst(b)))[i];
  

• 	bte v = ((bte*) Tloc(b, BUNfirst(b)))[i];
  if (v == bte_nil) {
  	val_tmp[i] = 0;
  	nul_tmp[i] = true;
  

@@ -121,7 +121,7 @@ static jobject getShortColumn(JNIEnv *en } else { for (i = 0; i < size; i++) {

• 	int v = ((short*) Tloc(b, BUNfirst(b)))[i];
  

• 	short v = ((short*) Tloc(b, BUNfirst(b)))[i];
  if (v == sht_nil) {
  	val_tmp[i] = 0;
  	nul_tmp[i] = true;
  

@@ -207,7 +207,7 @@ static jobject getLongColumn(JNIEnv *env } else { for (i = 0; i < size; i++) {

• 	int v = ((long*) Tloc(b, BUNfirst(b)))[i];
  

• 	long v = ((long*) Tloc(b, BUNfirst(b)))[i];
  if (v == lng_nil) {
  	val_tmp[i] = 0;
  	nul_tmp[i] = true;
  

@@ -250,7 +250,7 @@ static jobject getFloatColumn(JNIEnv *en } else { for (i = 0; i < size; i++) {

• 	int v = ((float*) Tloc(b, BUNfirst(b)))[i];
  

• 	float v = ((float*) Tloc(b, BUNfirst(b)))[i];
  if (v == flt_nil) {
  	val_tmp[i] = 0.0;
  	nul_tmp[i] = true;
  

@@ -293,7 +293,7 @@ static jobject getDoubleColumn(JNIEnv *e } else { for (i = 0; i < size; i++) {

• 	int v = ((double*) Tloc(b, BUNfirst(b)))[i];
  

• 	double v = ((double*) Tloc(b, BUNfirst(b)))[i];
  if (v == dbl_nil) {
  	val_tmp[i] = 0.0;
  	nul_tmp[i] = true;
  

@@ -346,7 +346,6 @@ static jobject getStringColumn(JNIEnv *e j++; } }

• // Create the column object // from Java StringColumn(String[] values, int columnSize, boolean[] nullIndex) column = (*env)->NewObject(env, columnClass, columnConstructor, values, size, nulls);

@@ -380,11 +379,9 @@ JNIEXPORT jobject JNICALL Java_org_monet return getLongColumn(env, b); break; case TYPE_flt:

• printf("float1\n");
  

  return getFloatColumn(env, b); break; case TYPE_dbl:

• printf("double1\n");
  

  return getDoubleColumn(env, b); break; case TYPE_str:

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